The Physical And Chemical Composition Of The Hair

1. What is a follicle?

An instrument used for measuring temperature

A type of leaf found in tropical regions

A tube like depression that is filled with the hair root

An ancient form of writing system used in Mesopotamia

A follicle is a small cavity or sac from which a hair grows. It is a tube-like depression that contains the hair root and helps support the growth of hair.

Explanation

A follicle is a small cavity or sac from which a hair grows. It is a tube-like depression that contains the hair root and helps support the growth of hair.

2. Where is the hair root located?

On the top of the head

At the end of the hair follicle

At the tip of the hair strand

Located below the surface of the scalp.

The hair root is located below the surface of the scalp to anchor the hair follicle and facilitate hair growth.

Explanation

The hair root is located below the surface of the scalp to anchor the hair follicle and facilitate hair growth.

3. What is the Hair Shaft?

Is the protein that gives hair its color.

Is the portion of hair that projects above the skin

Is the root of the hair follicle.

Is the layer of skin that surrounds the hair follicle.

The hair shaft is the part of the hair that can be seen above the surface of the skin

Explanation

The hair shaft is the part of the hair that can be seen above the surface of the skin

4. What is a hair bulb?

A unit of measurement for hair thickness

A type of hair accessory

A thickened club like stucture that forms the lowest part of the hair root

A chemical used in hair dyeing

The hair bulb is actually a thickened club like structure that forms the lowest part of the hair root, responsible for hair growth.

Explanation

The hair bulb is actually a thickened club like structure that forms the lowest part of the hair root, responsible for hair growth.

5. What is a dermal papilla?

Is a small cone like elevation at the base of the follicle that fits into the hair bulb containing blood and nerve supply and provides nutrients.

A small gland that secretes oil onto the skin surface

A type of skin disease affecting the epidermis

A type of cosmetic product used to treat acne

The dermal papilla is a crucial structure in the hair follicle responsible for providing blood and nerve supply as well as nutrients to the hair bulb, aiding in hair growth and health.

Explanation

The dermal papilla is a crucial structure in the hair follicle responsible for providing blood and nerve supply as well as nutrients to the hair bulb, aiding in hair growth and health.

6. What is the function of Arrector Pili?

A small involuntary muscle fibre that is inserted into the base of the hair follicle and contracts when exposed temperature change.

A gland that produces oil for the hair follicle

A type of protein found in hair follicles

A hormone responsible for hair growth

Arrector Pili is a small involuntary muscle fibre that is connected to the base of the hair follicle and contracts in response to various stimuli, especially temperature changes. This muscle contraction causes the hair to stand up, resulting in what is commonly known as 'goosebumps'.

Explanation

Arrector Pili is a small involuntary muscle fibre that is connected to the base of the hair follicle and contracts in response to various stimuli, especially temperature changes. This muscle contraction causes the hair to stand up, resulting in what is commonly known as 'goosebumps'.

7. What are Subaceous Glands?

Type of sweat glands

Endocrine glands in the brain

Glands of the skin connected to the follicle that secrete natural oil called Sebum, Sebum lubricates the hair and skin.

Digestive glands in the stomach

Subaceous glands are glands in the skin that secrete sebum to lubricate the hair and skin.

Explanation

Subaceous glands are glands in the skin that secrete sebum to lubricate the hair and skin.

8. What is the cuticle?

A type of hair treatment used to straighten curly hair.

A tool used for cutting hair into a specific style.

The outermost layer of the hair consisting of single overlapping layers of translucent scale like cells that overlap like shingles on a roof. A healthy compact layer helps protect hair against damage.

The innermost layer of the hair shaft responsible for hair color.

The cuticle refers to the outermost layer of the hair that provides protection and structure. It is not related to hair color, hair treatments, or cutting tools.

Explanation

The cuticle refers to the outermost layer of the hair that provides protection and structure. It is not related to hair color, hair treatments, or cutting tools.

9. What is the cortex in reference to hair?

The top layer of the hair shaft that provides shine and protection.

The outer layer of the skin that covers the hair follicle.

The middle layer of the hair shaft that contains 90% pigment of the hairs total and gives strenght and elasticity

The root of the hair that anchors it in the follicle.

The cortex is the middle layer of the hair shaft that plays a crucial role in providing strength and elasticity to the hair, while also containing the majority of the hair's pigment.

Explanation

The cortex is the middle layer of the hair shaft that plays a crucial role in providing strength and elasticity to the hair, while also containing the majority of the hair's pigment.

10. What is the medulla?

A bone located in the leg responsible for supporting body weight.

The central part of the brain responsible for basic life functions.

Is the innermost layer composed of round cells and not always present, fine or blonde hair lacks medulla

A type of plant found in tropical regions with medicinal properties.

The medulla refers to the innermost layer of hair composed of round cells and is not always present. Fine or blonde hair typically lacks a medulla.

Explanation

The medulla refers to the innermost layer of hair composed of round cells and is not always present. Fine or blonde hair typically lacks a medulla.

11. What is the chemical composition of the hair follicle?

Collagen

Carbohydrates

Protein

Lipids

The hair follicle is primarily composed of protein, specifically keratin. While collagen plays a role in the skin's elasticity, lipids provide moisture and protection, and carbohydrates serve as energy sources, they are not the main chemical composition of the hair follicle.

Explanation

The hair follicle is primarily composed of protein, specifically keratin. While collagen plays a role in the skin's elasticity, lipids provide moisture and protection, and carbohydrates serve as energy sources, they are not the main chemical composition of the hair follicle.

12. As the cells ___ they fill up with fibrous protein called keratin, move upward, lose their nucleus and die. This maturing process is called?

Keratinization by the time the hair emerges from the scalp the cells are kertanized and no longer living.

Apoptosis

Nucleation

Mitosis

During keratinization, cells fill up with keratin, move upward, lose their nucleus, and eventually die. This process is necessary for the formation of structures such as hair and nails.

Explanation

During keratinization, cells fill up with keratin, move upward, lose their nucleus, and eventually die. This process is necessary for the formation of structures such as hair and nails.

13. What percentage of protein is the hair composed of?

85%

50%

75%

90%

Hair is primarily made up of a protein called keratin, which contributes to about 90% of its composition.

Explanation

Hair is primarily made up of a protein called keratin, which contributes to about 90% of its composition.

14. What are the five elements that make up the hair?

Silicon, Fluorine, Bromine, Argon, Neon.

Iron, Magnesium, Calcium, Zinc, Aluminum.

Carbon, Oxygen, Nitrogen, Sulfur, and Hydrogen

Sodium, Potassium, Chlorine, Phosphorus, Iodine.

The correct elements that make up the hair are Carbon, Oxygen, Nitrogen, Sulfur, and Hydrogen.

Explanation

The correct elements that make up the hair are Carbon, Oxygen, Nitrogen, Sulfur, and Hydrogen.

15. What is a hydrogen bond?

Is a weak physical side bond broken by water or heat.

A hydrogen bond is a strong chemical bond.

A hydrogen bond is a type of covalent bond.

A hydrogen bond is an ionic bond.

Hydrogen bonds are weaker than covalent bonds but stronger than van der Waals interactions. They play a crucial role in various biological processes and interactions.

Explanation

Hydrogen bonds are weaker than covalent bonds but stronger than van der Waals interactions. They play a crucial role in various biological processes and interactions.