Chapter 11 Properties Of The Hair And Scalp

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The middle layer of the hair is the:
- Cortex
- Carbuncle
- Canity
- Catagen

About This Quiz

Are you looking to get information on hair or hairstyles? If yes, take this quiz chapter 11 properties of the hair and scalp test and answer the questions. The quiz has very informative facts, trivia, and practical knowledge questions regarding your hair. The quiz gives you scientific information on hair type and how to make your hair look better. If you like the quiz, share it with your friends and family. All the best!

Chapter 11 Properties Of The Hair And Scalp - Quiz

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2.

The oil glands in the skin that are connected to the hair follicles are the _______________ glands.
- Systine
- Simplex
- Sebaceous
- Scutulua
Correct Answer

A. Sebaceous

Explanation

The correct answer is sebaceous. The oil glands in the skin that are connected to the hair follicles are called sebaceous glands. These glands produce sebum, an oily substance that helps to moisturize and protect the skin and hair.

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1
3.

Hair follicles are not found on the:
- Forehead area
- Back of the hands
- Soles of the feet
- Back of the neck
Correct Answer

A. Soles of the feet

Explanation

Hair follicles are not found on the soles of the feet because the skin on the soles is thick and does not have hair follicles. Hair follicles are responsible for producing and growing hair, but the skin on the soles of the feet is adapted for bearing weight and walking, so it does not have hair follicles.

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4.

The _______________ is the innermost layer of the hair.
- Tinea
- Monilethrix
- Medulla
- Scutula
Correct Answer

A. Medulla

Explanation

The medulla is the innermost layer of the hair. It is a soft, spongy, and flexible layer that runs through the center of the hair shaft. The medulla is not always present in every hair strand, and its presence or absence can vary depending on the individual and the type of hair. It plays a role in the overall strength and elasticity of the hair.

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5.

To help minimize tangles in extremely curly hair when washing, you should use:
- A drying shampoo
- Strong scalp manipulations
- A detangling rinse
- Soap instead of shampoo
Correct Answer

A. A detangling rinse

Explanation

To help minimize tangles in extremely curly hair when washing, using a detangling rinse is the best option. Detangling rinses are specifically formulated to soften and smooth the hair, making it easier to comb through and reducing the risk of tangles. Drying shampoos may strip the hair of its natural oils, leading to further tangling, while strong scalp manipulations can cause breakage and damage to the hair. Using soap instead of shampoo may not provide the necessary conditioning properties to prevent tangles.

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6.

Hair texture is classified as:
- Wavy, straight, or curly
- Coarse, medium, or fine
- Light, medium, or dark
- Long, medium, or short
Correct Answer

A. Coarse, medium, or fine

Explanation

Hair texture is classified as coarse, medium, or fine based on the diameter of the individual hair strands. Coarse hair has a larger diameter and feels thicker and more robust, while fine hair has a smaller diameter and feels thinner and more delicate. Medium hair falls in between coarse and fine hair in terms of thickness. This classification helps in determining the appropriate hair care products and styling techniques for different hair types.

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7.

The scientific study of hair, its diseases, and care is called:
- Dermatology
- Trichology
- Biology
- Cosmetology
Correct Answer

A. Trichology

Explanation

Trichology is the correct answer because it specifically refers to the scientific study of hair, its diseases, and care. Dermatology is the study of skin, biology is the study of living organisms in general, and cosmetology is the study of beauty treatments and cosmetics. Therefore, trichology is the most appropriate term for the study of hair.

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8.

A oily substance secreted from the sebaceous glands is:
- Sweat
- Lymph
- Catagen
- Sebum
Correct Answer

A. Sebum

Explanation

Sebum is the oily substance secreted from the sebaceous glands. These glands are found in the skin and their main function is to produce sebum, which helps to lubricate and waterproof the skin and hair. Sebum also helps to protect the skin from drying out and provides a natural barrier against bacteria and other pathogens. Sweat, lymph, and catagen are not substances secreted from the sebaceous glands, making sebum the correct answer.

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9.

The five main elements that make up the chemical composition of human hair are carbon, oxygen, hydrogen, and :
- Lead and zinic
- Keratin and selenium
- Born and calcium
- Nitrogen and sulfur
Correct Answer

A. Nitrogen and sulfur

Explanation

Human hair is primarily made up of a protein called keratin, which contains the elements carbon, oxygen, hydrogen, nitrogen, and sulfur. Therefore, the correct answer is nitrogen and sulfur.

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10.

The ability of the hair to absorb moisture is called:
- Hair absorbency
- Hair porosity
- Hair saturation
- Hair stream
Correct Answer

A. Hair porosity

Explanation

Hair porosity refers to the ability of the hair to absorb and retain moisture. It is determined by the condition of the hair cuticle, which can be either tightly closed, normal, or raised. Hair with low porosity has a tightly closed cuticle, making it difficult for moisture to penetrate. Hair with high porosity has a raised cuticle, allowing moisture to easily enter and escape. Understanding hair porosity helps in choosing the right hair care products and treatments to maintain optimal moisture balance and prevent damage.

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11.

The technical term used to describe gray hair is:
- Canities
- Tinea
- Alopecia
- Albino
Correct Answer

A. Canities

Explanation

Canities is the correct technical term used to describe gray hair. It refers to the natural graying of hair due to the loss of pigment melanin. This term is commonly used in medical and scientific contexts to describe the phenomenon of hair turning gray or white with age. Tinea refers to a fungal infection of the skin, alopecia refers to hair loss, and albino describes a person or animal with a congenital absence of pigment, resulting in white hair, skin, and eyes.

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12.

Shaving, clipping, and cutting the hair on the head:
- Makes it grow back faster
- Makes it grow back darker
- Makes it grow back coarser
- Has no effect on hair growth
Correct Answer

A. Has no effect on hair growth

Explanation

Shaving, clipping, and cutting the hair on the head do not affect the rate or pattern of hair growth. The idea that hair grows back faster, darker, or coarser after being cut is a common misconception. Hair growth is determined by factors such as genetics, hormones, and overall health, not by external factors like cutting or shaving. Therefore, these actions have no effect on hair growth.

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1
13.

Asians tend to have:
- Extremely straight hair
- Extremely curly hair
- Straight to wavy hair
- Wavy to curly hair
Correct Answer

A. Extremely straight hair

Explanation

Asians tend to have extremely straight hair. This is a common characteristic among many Asians, as their hair typically lacks natural curl or wave. This straight hair texture is often attributed to genetic factors and is a distinguishing feature of Asian hair types.

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14.

A highly contagious skin disease caused by a parasite called a mite that burrows under the skin is:
- Capitis
- Scabies
- Furuncle
- Carbuncle
Correct Answer

A. Scabies

Explanation

Scabies is a highly contagious skin disease caused by a mite that burrows under the skin. The mite, known as Sarcoptes scabiei, causes intense itching and a rash that is typically worse at night. It is transmitted through close personal contact or by sharing contaminated items such as clothing or bedding. Scabies can affect people of all ages and is commonly found in crowded living conditions such as nursing homes or prisons. Treatment usually involves topical medications to kill the mites and relieve symptoms.

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15.

The chemical bonds that hold together the amino acid molecules are called:
- Convex bonds
- Peptide bonds
- Helium bonds
- Protein bonds
Correct Answer

A. Peptide bonds

Explanation

Peptide bonds are the correct answer because they are the chemical bonds that link amino acids together in a protein chain. These bonds form through a condensation reaction, where the carboxyl group of one amino acid reacts with the amino group of another, resulting in the formation of a peptide bond and the release of a water molecule. Peptide bonds are crucial for the structure and function of proteins, as they determine the specific sequence and shape of the protein chain.

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1
16.

A _______________ bond is a physical bond easily broken by water or heat.
- Hydrogen
- Hydrophilic
- Hydrophobic
- Helix
Correct Answer

A. Hydrogen

Explanation

A hydrogen bond is a physical bond easily broken by water or heat. Hydrogen bonds occur when a hydrogen atom is attracted to an electronegative atom, such as oxygen or nitrogen. These bonds are relatively weak and can be disrupted by the presence of water or by an increase in temperature.

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17.

Which type of hair almost never has a medulla?
- Oily
- Pigmented
- Dark
- Vellus
Correct Answer

A. Vellus

Explanation

Vellus hair is a type of hair that is very fine and short, commonly found on the body of children and women. It is often referred to as "peach fuzz" and does not have a medulla, which is the innermost layer of the hair shaft. The absence of a medulla in vellus hair is due to its thin and delicate nature. This distinguishes vellus hair from other types of hair, such as oily, pigmented, and dark hair, which typically have a medulla.

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18.

Dandruff can easily be mistaken for:
- Tinea
- Dry scalp
- Pediculosis capris
- Trichoptilosis
Correct Answer

A. Dry scalp

Explanation

Dandruff can easily be mistaken for dry scalp because both conditions result in flakes of dead skin on the scalp. However, there are some differences between the two. Dandruff is usually accompanied by itching and can be caused by an overgrowth of a yeast-like fungus on the scalp. On the other hand, dry scalp is caused by a lack of moisture and oil on the scalp, leading to dryness and flaking. While both conditions may appear similar, the underlying causes and treatments differ.

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19.

Tinea is characterized by:
- Numbness
- Blisters
- Sudden hair loss
- Itching
Correct Answer

A. Itching

Explanation

Tinea is a fungal infection of the skin, commonly known as ringworm. It is characterized by itching, redness, and a circular rash. Numbness and blisters are not typical symptoms of tinea. Sudden hair loss may occur if the infection affects the scalp, but it is not a defining characteristic. Therefore, the correct answer is itching, as it is a common symptom experienced by individuals with tinea.

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20.

Fine hair is _____________ than coarse or medium hair.
- Thicker
- Harder tp process
- Less susceptible to damage from chemical services
- More fragile
Correct Answer

A. More fragile

Explanation

Fine hair is more fragile than coarse or medium hair. This means that it is more prone to breakage and damage. Fine hair strands are thinner and have less density, making them more delicate and easier to break. They require gentle handling and special care to prevent damage from styling, heat, and chemical treatments.

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21.

The measurement of individual hair strands on 1 square inch (2.5 square centimeters) of the scalp is:
- Hair density
- Hair elasticity
- Hair texture
- Hair porosity
Correct Answer

A. Hair density

Explanation

Hair density refers to the number of individual hair strands on a given area of the scalp. It is measured by counting the number of hairs in a specific square inch or centimeter of the scalp. This measurement helps determine how thick or thin a person's hair is.

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22.

Oily scalp and hair can be treated by properly washing it:
- Without shampoo
- With normalizing shampoo
- With conditioning shampoo
- With dry shampoo
Correct Answer

A. With normalizing shampoo

Explanation

Normalizing shampoo is specifically designed to treat oily scalp and hair. It helps to balance the scalp's natural oil production and remove excess oil and buildup. By using a normalizing shampoo, it can effectively cleanse the scalp and hair, leaving them feeling clean and refreshed.

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23.

The medical term for dandruff is:
- Canities
- Pityriasis
- Alopecia
- Simplex
Correct Answer

A. Pityriasis

Explanation

The correct answer for the medical term for dandruff is "pityriasis." Pityriasis is a common skin condition characterized by the excessive shedding of dead skin cells from the scalp, resulting in white or gray flakes. It is often accompanied by itching and can be caused by various factors such as dry skin, fungal infections, or certain skin conditions. Canities refers to the graying of hair, alopecia is the medical term for hair loss, and simplex refers to a condition that is uncomplicated or not involving other factors.

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24.

The infestation of hair and scalp with head lice is called:
- Hyperttichosis
- Trichoptilosis
- Pediculosis capitis
- Fragilitas cranium
Correct Answer

A. Pediculosis capitis

Explanation

The correct answer is pediculosis capitis. Pediculosis capitis refers to the infestation of hair and scalp with head lice. Hyperttichosis is a condition characterized by excessive hair growth. Trichoptilosis is the splitting or fraying of hair ends. Fragilitas cranium is not a recognized term related to head lice infestation.

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25.

Dandruff is believed to be caused by a:
- Bacterium
- Virus
- Parasite
- Fungus
Correct Answer

A. Fungus

Explanation

Dandruff is caused by a fungus. Fungal infections on the scalp can lead to the shedding of dead skin cells, which appear as dandruff. This fungus, known as Malassezia, is naturally present on the scalp but can multiply excessively, leading to dandruff. It feeds on the natural oils produced by the scalp, causing irritation and flaking. Antifungal treatments, such as medicated shampoos, are often used to control dandruff by reducing the overgrowth of this fungus.

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26.

Coarse hair:
- Has the smallest diameter of the three types of hair texture
- Is the most common hair texture
- Is not resistant to chemical services
- Is stronger than fine hair
Correct Answer

A. Is stronger than fine hair

Explanation

Coarse hair is stronger than fine hair because it has a larger diameter and more protein content. The larger diameter of coarse hair provides more structural support, making it less prone to breakage. Additionally, coarse hair typically has a higher density of cuticle layers, which adds to its strength. Fine hair, on the other hand, has a smaller diameter and fewer cuticle layers, making it more fragile and susceptible to damage. Therefore, coarse hair is stronger than fine hair.

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27.

A tuft of hair that strands straight up is a:
- Cystine
- Cysteine
- Cortex
- Cowlick
Correct Answer

A. Cowlick

Explanation

A cowlick is a tuft of hair that stands straight up, often in a different direction from the rest of the hair. This occurs due to the natural growth pattern of the hair follicles, causing the hair in that area to resist lying flat. Cowlicks are commonly found on the crown of the head and can be difficult to style or control.

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1
28.

The _____________ phase signals the end of the growth phase.
- Cysteine
- Cystine
- Anlagen
- Catagen
Correct Answer

A. Catagen

Explanation

The catagen phase signals the end of the growth phase. During this phase, the hair follicle stops producing new cells and the hair stops growing. It is a transitional phase between the active growth phase (anagen) and the resting phase (telogen).

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1
29.

Scalp message __________________ hair growth.
- Increases
- Decreases
- Does not affect
- Is necessary for
Correct Answer

A. Does not affect

Explanation

A scalp massage does not affect hair growth. While a scalp massage can improve blood circulation and promote relaxation, it does not directly impact the growth of hair follicles. Hair growth is primarily determined by factors such as genetics, hormones, and overall health. Therefore, a scalp massage may feel good and have other benefits, but it does not have a direct effect on hair growth.

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30.

Finasteride ia an oral prescription medication for hair loss that meant for:
- Men only
- Women only
- Men and women
- Animals
Correct Answer

A. Men only

Explanation

Finasteride is an oral prescription medication specifically designed for men. It is used to treat male pattern baldness, a condition that affects men and causes hair loss. The medication works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT), which is the hormone responsible for hair loss in men. Since women do not typically experience male pattern baldness, finasteride is not recommended for them. Therefore, the correct answer is "men only".

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1
31.

Which type of melanin provides natural colors ranging from red and ginger to yellow and blond tones?
- Pheomelanin
- Eumelanin
- Polymelanin
- Biomelanin
Correct Answer

A. Pheomelanin

Explanation

Pheomelanin is the type of melanin that provides natural colors ranging from red and ginger to yellow and blond tones. Eumelanin is responsible for darker hair colors, while polymelanin and biomelanin are not involved in determining hair color.

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32.

The growth phase during which new hair is produced is:
- Patagen
- Telogen
- Anagen
- Catagen
Correct Answer

A. Anagen

Explanation

During the anagen phase, new hair is produced. This is the active growth phase of the hair follicle, where cells divide rapidly and hair grows at a rate of about half an inch per month. This phase can last for several years, and it is during this phase that the hair shaft is formed and pushed up through the scalp.

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33.

Scalp hair grows ______________ on women than on men.
- Slower
- Faster
- Thinner
- Thicker
Correct Answer

A. Faster

Explanation

Women generally have faster hair growth compared to men. This is due to hormonal differences between the sexes. Women tend to have higher levels of estrogen, which promotes hair growth, while men have higher levels of testosterone, which can slow down hair growth. Additionally, women's hair follicles may be more active and have a shorter resting phase, leading to faster growth. Therefore, the correct answer is "faster".

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2
34.

Bald men are commonly perceived as:
- More assertive
- Younger
- More physically attractive
- Less successful
Correct Answer

A. Less successful

Explanation

Bald men are commonly perceived as less successful. This perception may stem from societal stereotypes and biases that associate baldness with aging and a decline in physical attractiveness. These stereotypes can lead to assumptions that bald men are less successful in their careers or personal lives, despite there being no actual correlation between baldness and success. It is important to recognize and challenge these stereotypes to prevent unfair judgments based on appearance.

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35.

The ______________ is the outermost layer of hair.
- Hair cuticle
- Hair bulb
- Hair follicle
- Hair root
Correct Answer

A. Hair cuticle

Explanation

The hair cuticle is the outermost layer of hair. It acts as a protective covering for the inner layers of the hair shaft. It consists of overlapping scales that help to protect the hair from damage and keep it hydrated. The cuticle also plays a role in determining the texture and appearance of the hair.

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36.

The ________________ is a tiny, involuntary muscle in the base of the hair follicle.
- Medulla
- Arrector pili
- Tinea
- Dermal papilla
Correct Answer

A. Arrector pili

Explanation

The arrector pili is a tiny, involuntary muscle located at the base of the hair follicle. This muscle is responsible for causing the hair to stand up straight, resulting in the phenomenon commonly known as "goosebumps." When the arrector pili muscle contracts, it pulls on the hair follicle, causing the hair to become more erect. This response is often triggered by cold temperatures or strong emotions, such as fear or excitement.

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37.

Wet hair with normal elasticity will stretch up to ______________ of its original length.
- 25 perecent
- 40 percent
- 50 percent
- 70 percent
Correct Answer

A. 50 percent

Explanation

Wet hair with normal elasticity will stretch up to 50 percent of its original length. This means that when wet, the hair can be stretched to half of its original length without breaking or losing its shape. This is an important characteristic of healthy hair, as it indicates that it can withstand some tension and manipulation without being damaged.

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1
38.

Hair is approximately __________________ percent protein.
- 60
- 70
- 80
- 90
Correct Answer

A. 90

Explanation

Hair is made up of a protein called keratin, which accounts for its strength and structure. Therefore, it can be concluded that hair is approximately 90 percent protein.

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39.

The medulla is composed of ________________ cells.
- Rod-shaped
- Round
- Spiral-shaped
- Rectangular
Correct Answer

A. Round

Explanation

The medulla is composed of round cells.

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40.

The average growth of healthy scalp hair is:
- 1/2 inch (1.25 cm) per week
- 1 inch (2.5 cm) per week
- 1/2 inch (1.25 cm)per month
- 1 inch (2.5 cm) per month
Correct Answer

A. 1/2 inch (1.25 cm)per month
41.

Hair that forms in a circular pattern on the crown of the head is called:
- Crown hair
- Cowlick
- Ringed hair
- Whorl
Correct Answer

A. Whorl

Explanation

A whorl is a term used to describe hair that forms in a circular pattern on the crown of the head. It is characterized by a specific direction of hair growth that creates a circular or spiral shape. This term is commonly used in the field of hairstyling and hair analysis to identify and classify different hair patterns. The other options, crown hair, cowlick, and ringed hair, do not accurately describe this specific circular pattern of hair growth on the crown of the head.

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2
42.

Vellus hair is also knows:
- Lanugo hair
- Lanthionine hair
- Malassezia hair
- Monilethrix hair
Correct Answer

A. Lanugo hair

Explanation

Vellus hair is also known as lanugo hair. Lanugo hair refers to the fine, soft, and unpigmented hair that covers the body of a fetus or newborn baby. It is usually shed and replaced by terminal hair, which is thicker and more pigmented, as the baby grows. This type of hair is different from other types mentioned in the question, such as lanthionine hair, malassezia hair, and monilethrix hair, which are not related to vellus hair.

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1
43.

Cross-sections of hair:
- Are always round
- Are always oval
- Are always flattened
- Can be almost any shape
Correct Answer

A. Can be almost any shape

Explanation

Cross-sections of hair can be almost any shape because hair can vary in texture and thickness from person to person. The shape of the cross-section is determined by the shape of the hair follicle, which can be round, oval, or flattened. This variation in shape is what gives individuals their unique hair types, such as straight, wavy, or curly. Therefore, it is incorrect to say that cross-sections of hair are always round, oval, or flattened, as they can be almost any shape.

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44.

Congenital canities manifests:
- At or before birth
- During adolescence
- During middle age
- In the later years of life
Correct Answer

A. At or before birth

Explanation

Congenital canities refers to the premature graying of hair that occurs at or before birth. This condition is rare and occurs due to a lack of pigment-producing cells in the hair follicles. Unlike regular graying of hair that happens with age, congenital canities is present from birth or develops during infancy. The premature graying is usually uniform and affects all the hair on the body.

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0
45.

The naturally occurring fungus that causes the symptoms of dandruff when it grows out of control is:
- Medulla
- Monilenthrix
- Malassezia
- Hypertrichosifs
Correct Answer

A. Malassezia

Explanation

Malassezia is the correct answer because it is a naturally occurring fungus that can cause dandruff when it overgrows on the scalp. This fungus is commonly found on the skin of humans, but when it multiplies excessively, it can lead to the flaking and itching associated with dandruff. Controlling the growth of Malassezia is important in managing dandruff symptoms.

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46.

A condition of abnormal hair growth on areas of the body is:
- Trichorrhexis
- Ringed hair
- Hypertrichosis
- Electrolysis
Correct Answer

A. Hypertrichosis

Explanation

Hypertrichosis is the correct answer because it refers to a condition of abnormal hair growth on areas of the body. This condition causes excessive hair growth beyond what is considered normal for a person's age, sex, and ethnic background. Hypertrichosis can occur in specific areas or can be generalized, affecting the entire body. It can be caused by various factors, including genetics, hormonal imbalances, medications, and certain medical conditions.

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47.

Salt bonds account for about _______________ of the hair's overall strength.
- One-quarter
- One-half
- One-third
- Two-thirds
Correct Answer

A. One-third

Explanation

Salt bonds account for about one-third of the hair's overall strength. These bonds are formed between the positive and negative charges of amino acids in the hair protein structure. They contribute to the hair's strength and stability, but they are not as strong as other types of bonds like disulfide bonds. Therefore, one-third is the correct answer as it indicates the approximate proportion of the hair's overall strength that can be attributed to salt bonds.

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1
48.

The anagen phase generally lasts from three to five:
- Days
- Weeks
- Months
- Years
Correct Answer

A. Years

Explanation

The anagen phase refers to the active growth phase of hair follicles. During this phase, the hair cells divide rapidly, resulting in the growth of new hair. The anagen phase can vary in duration depending on various factors, such as genetics and overall health. While it typically lasts for a few years, it can range from three to five years in most individuals.

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49.

The term for the spiral shape of a coiled protein is:
- Matrix
- Cystine
- Helix
- Cysteine
Correct Answer

A. Helix

Explanation

The term for the spiral shape of a coiled protein is helix. A helix is a three-dimensional structure formed by a chain of amino acids that twist around a central axis. This structure is stabilized by hydrogen bonds between the amino acids. The helix shape is an important characteristic of proteins and plays a crucial role in their function and stability.

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Chapter 11 Properties Of The Hair And Scalp

The middle layer of the hair is the:

Quiz Preview

The oil glands in the skin that are connected to the hair follicles are the _______________ glands.

Hair follicles are not found on the:

The _______________ is the innermost layer of the hair.

To help minimize tangles in extremely curly hair when washing, you should use:

Hair texture is classified as:

The scientific study of hair, its diseases, and care is called:

A oily substance secreted from the sebaceous glands is:

The five main elements that make up the chemical composition of human hair are carbon, oxygen, hydrogen, and :

The ability of the hair to absorb moisture is called:

The technical term used to describe gray hair is:

Shaving, clipping, and cutting the hair on the head:

Asians tend to have:

A highly contagious skin disease caused by a parasite called a mite that burrows under the skin is:

The chemical bonds that hold together the amino acid molecules are called:

A _______________ bond is a physical bond easily broken by water or heat.

Which type of hair almost never has a medulla?

Dandruff can easily be mistaken for:

Tinea is characterized by:

Fine hair is _____________ than coarse or medium hair.

The measurement of individual hair strands on 1 square inch (2.5 square centimeters) of the scalp is:

Oily scalp and hair can be treated by properly washing it:

The medical term for dandruff is:

The infestation of hair and scalp with head lice is called:

Dandruff is believed to be caused by a:

Coarse hair:

A tuft of hair that strands straight up is a:

The _____________ phase signals the end of the growth phase.

Scalp message __________________ hair growth.

Finasteride ia an oral prescription medication for hair loss that meant for:

Which type of melanin provides natural colors ranging from red and ginger to yellow and blond tones?

The growth phase during which new hair is produced is:

Scalp hair grows ______________ on women than on men.

Bald men are commonly perceived as:

The ______________ is the outermost layer of hair.

The ________________ is a tiny, involuntary muscle in the base of the hair follicle.

Wet hair with normal elasticity will stretch up to ______________ of its original length.

Hair is approximately __________________ percent protein.

The medulla is composed of ________________ cells.

The average growth of healthy scalp hair is:

Hair that forms in a circular pattern on the crown of the head is called:

Vellus hair is also knows:

Cross-sections of hair:

Congenital canities manifests:

The naturally occurring fungus that causes the symptoms of dandruff when it grows out of control is:

A condition of abnormal hair growth on areas of the body is:

Salt bonds account for about _______________ of the hair's overall strength.

The anagen phase generally lasts from three to five:

The term for the spiral shape of a coiled protein is: