Integumentary System And Body Temperature
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Which of the following is least true of the epidermis?
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Thin outer layer of the skin
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Contains a rich supply of blood vessels
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Contains the stratum germinativum and stratum corneum
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Cells become keratinized
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Explore the structure and functions of the integumentary system, focusing on the epidermis, dermis, and subcutaneous layers, and understand body temperature regulation on hot and humid days.
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- 2.
Epidermal cells become keratinized meaning that they
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Appear yellow
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Are hardened and water-resistant
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Have been replaced by connective tissue
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Appear cyanotic
Correct Answer
A. Are hardened and water-resistantExplanation
Epidermal cells become keratinized, which means that they undergo a process where they become hardened and water-resistant. This is a natural process that occurs as the cells in the outermost layer of the skin produce a protein called keratin. This protein helps to strengthen and protect the skin, making it less permeable to water and more resistant to damage. As a result, the skin becomes tougher and less prone to drying out or becoming damaged by environmental factors.Rate this question:
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- 3.
The dermis
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Contains the stratum germinativum and the stratum corneum
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Contains the blood vessels that oxygenate the epidermis
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Cannot stretch
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Is the target for subcutaneous injections
Correct Answer
A. Contains the blood vessels that oxygenate the epidermisExplanation
The dermis is the layer of skin that contains the blood vessels that supply oxygen to the epidermis. This is important because the epidermis, which is the outermost layer of the skin, does not have its own blood supply. The dermis acts as a support system for the epidermis and provides it with the necessary nutrients and oxygen through its network of blood vessels.Rate this question:
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- 4.
The subcutaneous layer
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Is located directly under the epidermis
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Contains the stratum germinativum
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Is the later that tans when exposed to ultraviolet radiation
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Supports the dermis
Correct Answer
A. Supports the dermisExplanation
The subcutaneous layer is a layer of fat and connective tissue located directly under the dermis. It acts as a support for the dermis and helps to anchor it to the underlying structures such as muscles and bones. This layer also provides insulation, cushioning, and protection for the body. It contains blood vessels and nerves that supply the skin and helps regulate body temperature. The subcutaneous layer does not contain the stratum germinativum, which is found in the epidermis. It also does not tan when exposed to ultraviolet radiation, as tanning occurs in the epidermis.Rate this question:
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- 5.
Why do we feel the heat intensely on a hot and humid day?
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Heat loss increases because of an increase in evaporation
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Vasoconstriction trapts heat in the body
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Heat loss decreases because of a decrease in evaporation
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The arrector pili muscles work overtime
Correct Answer
A. Heat loss decreases because of a decrease in evaporationExplanation
On a hot and humid day, the air is already saturated with moisture, making it difficult for sweat to evaporate from our skin. Evaporation is a cooling process that helps to dissipate heat from our bodies. When evaporation is hindered, such as in high humidity, our bodies are unable to effectively cool down through this mechanism. As a result, heat loss decreases, causing us to feel the heat more intensely.Rate this question:
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- 6.
Epidermal cells desquamate or exfoliate, meaning that they
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Become yellow
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Form calluses
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Slough
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Synthesize vitamin D in response to ultraviolet radiation
Correct Answer
A. SloughExplanation
Epidermal cells desquamate or exfoliate, meaning that they slough off. This process involves the shedding or peeling of dead skin cells from the outermost layer of the skin. It is a natural part of the skin's renewal process, allowing for the growth of new cells.Rate this question:
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- 7.
Which of the following is true of the stratum germinativum?
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The cells are dead and are constantly sloughed
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Is part of the dermis
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Originates in the hypodermis
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Replenishes the cells of the epidermis that have sloughed
Correct Answer
A. Replenishes the cells of the epidermis that have sloughedExplanation
The stratum germinativum is a layer of the epidermis, not the dermis or hypodermis. It is responsible for replenishing the cells of the epidermis that have sloughed off. This layer contains living cells that continuously divide and produce new cells, ensuring the regeneration and renewal of the epidermis.Rate this question:
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- 8.
The skin over your knuckles is wrinkled and creased because it is
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Keratinized
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Avascular
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Dead
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Anchored directly to bone
Correct Answer
A. Anchored directly to boneExplanation
The skin over your knuckles is wrinkled and creased because it is anchored directly to bone. This anchoring provides stability and support to the skin, preventing it from sliding or moving excessively over the knuckles. As a result, the skin becomes folded and wrinkled, allowing for greater flexibility and movement of the fingers.Rate this question:
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- 9.
Albinism, freckles, vitiligo, moles, and tanning are conditions that are all associated with which of the following?
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Cancer
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Melanin
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Cell necrosis
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Keratinization
Correct Answer
A. MelaninExplanation
The conditions mentioned in the question, such as albinism, freckles, vitiligo, moles, and tanning, are all associated with melanin. Melanin is a pigment that gives color to the skin, hair, and eyes. Albinism is a genetic condition where the body is unable to produce melanin, resulting in very light or white skin and hair. Freckles, vitiligo, and moles are all related to variations in the production or distribution of melanin in the skin. Tanning occurs when the skin produces more melanin in response to UV radiation from the sun.Rate this question:
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- 10.
Alopecia is most likely to occur in a
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Tanned patient
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Cyanotic patient
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Patient who is being treated with anticancer drugs
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Patient with vitiligo
Correct Answer
A. Patient who is being treated with anticancer drugsExplanation
Alopecia refers to hair loss, which can occur as a side effect of certain medications, including anticancer drugs. These drugs can affect the hair follicles and lead to hair thinning or complete hair loss. Therefore, a patient who is being treated with anticancer drugs is most likely to experience alopecia compared to the other options provided.Rate this question:
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- 11.
Which of the following is related to eccrine glands?
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Classified as endocrine glands
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Secrete sebum
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Secrete sweat
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Are called oil glands
Correct Answer
A. Secrete sweatExplanation
Eccrine glands are related to the secretion of sweat. These glands are not classified as endocrine glands, as they are exocrine glands that release their secretions onto the skin surface. They do not secrete sebum, which is the oily substance produced by the sebaceous glands. The term "oil glands" is commonly used to refer to the sebaceous glands, not the eccrine glands.Rate this question:
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- 12.
Nonshivering thermogenesis in the neonate
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Is accomplished by contracting skeletal muscles
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Is due to the contraction of the arrector pili muscles
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Is a heat-loss mechanism
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Is accomplished by the metabolism of brown fat.
Correct Answer
A. Is accomplished by the metabolism of brown fat.Explanation
Nonshivering thermogenesis in the neonate is accomplished by the metabolism of brown fat. Brown fat is a specialized type of fat that is rich in mitochondria and has a high metabolic activity. When activated, brown fat generates heat through the process of uncoupling oxidative phosphorylation, which increases metabolic rate and produces heat. This mechanism allows neonates to maintain their body temperature in cold environments, as they have a limited ability to shiver. Contrary to the other options, nonshivering thermogenesis is not accomplished by contracting skeletal muscles, the contraction of arrector pili muscles, or as a heat-loss mechanism.Rate this question:
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- 13.
Which of the following people is most likely to exhibit hirsutism?
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Person who is chronically hypoxic (low oxygen) because of a lung disease
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A person who has liver failure and therefore has excess bilirubin in his blood
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A woman who is taking testosterone
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A male who has been castrated (loss of testicular function)
Correct Answer
A. A woman who is taking testosteroneExplanation
A woman who is taking testosterone is most likely to exhibit hirsutism. Testosterone is a male sex hormone that promotes the development of masculine characteristics, including hair growth. When a woman takes testosterone, it can lead to an increase in hair growth in areas typically associated with males, such as the face, chest, and back. This excessive hair growth is known as hirsutism.Rate this question:
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- 14.
Which of the following people is most likely to exhibit clubbing?
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Person who is chronically hypoxic (low oxygen) because of a lung disease
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A person who has liver failure and therefore has excess bilirubin in his blood
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A woman who is taking testosterone
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A male who has been castrated (loss of testicular function)
Correct Answer
A. Person who is chronically hypoxic (low oxygen) because of a lung diseaseExplanation
Clubbing refers to the abnormal enlargement of the fingertips and nails. It is commonly associated with chronic hypoxia, which is a condition characterized by low oxygen levels in the body. In this case, a person with a lung disease would be more likely to exhibit clubbing because their chronic hypoxia leads to the body's compensatory response of increasing blood flow to the fingertips, resulting in the characteristic changes in the nails and fingertips. The other options, such as liver failure, testosterone use, or castration, do not typically cause clubbing.Rate this question:
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- 15.
Which patient is most likely to require an eschoarotomy?
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A person who is cyanotic
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A person with severe digital clubbing
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A severely burned patient
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A person with drug-induced urticaria
Correct Answer
A. A severely burned patientExplanation
A severely burned patient is most likely to require an escharotomy because severe burns can cause the skin to become tight and constrictive, leading to impaired blood flow and potential compartment syndrome. An escharotomy is a surgical procedure where an incision is made through the burned tissue to relieve the pressure and restore blood flow. This procedure is necessary to prevent further damage and promote proper healing in severely burned patients.Rate this question:
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- 16.
Why does the skin become dry, coarse, and itchy in the older person? There is
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A decrease in the amount of adipose tissue
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An increase in the blood flow to the skin
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An increased fragility of the skin
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Decreased sebaceous gland activity in the skin
Correct Answer
A. Decreased sebaceous gland activity in the skinExplanation
As a person ages, there is a decrease in sebaceous gland activity in the skin. Sebaceous glands produce sebum, which helps to moisturize and protect the skin. When the activity of these glands decreases, the skin becomes dry because it lacks sufficient moisture. This dryness can lead to coarseness and itchiness, as the skin becomes more prone to irritation and inflammation. Additionally, decreased sebaceous gland activity can also result in a loss of the skin's natural protective barrier, making it more susceptible to damage and infection.Rate this question:
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- 17.
Why do older people tend to feel cold?
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The is a decrease in the amount of adipose tissue under the skin
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There is an increase of blood flow to the skin, resulting in excess cooling
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Metabolic rate increases with age.
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Keratinization decreases with age.
Correct Answer
A. The is a decrease in the amount of adipose tissue under the skinExplanation
As people age, there is a natural decrease in the amount of adipose tissue (fat) under the skin. Adipose tissue acts as insulation and helps to keep the body warm. With less fat, there is less insulation, making older people more susceptible to feeling cold. This decrease in adipose tissue is a common physiological change that occurs with aging.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Mar 10, 2009Quiz Created by
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