Question

r3 Review Questio..SavedHelp Save & Exit Submit Check my work Which of the following statements is true about skin? Multiple Choice 0 The skin is involved in vitamin C production. The skin becomes thinner and less elastic with age. es The skin contains collagen and keratin fibers in the epidermis. The skin regulates temperature by producing sebum.

Answer 1

1. Which of the following statements is true about skin?

Correct Option: The skin becomes thinner and less elastic with age

Note: The skin gets thinner as the epidermis layer gets degraded with age and the elastic tissues like collagen and elastin gradually loose, so the skin gets loosen or less elastic.

2. For healthy skin, the vitamin(s) necessary for collagen production is (are) _

Correct option: Vitamin A and Vitamin C

Note: Vitamin A or beta-carotenoid is a potent anti-oxidant which helps protect skin collagen from breaking down by UV ray. Also vitamin A stimulates growth of fibroblasts, which helps formation of skin layers. Vitamin C is important for collagen production, as it helps enzyme prolyl hydroxylase to form mature collagen.

3. Which of the following is not associated with a function of the skin?

Correct Option: Blood Pressure

Note: Blood pressure is not controlled by skin, as blood vessels within skin are way too thin to be having any effect of pressure change by skin.

4. Of the following, which is the deadliest form of skin cancer?

Correct Option: Melanoma

Note: Melanoma is the most lethal form of skin cancer. It is hard to identify from harmless mole. It arises when the melanocyte cells at the basal layer of epidermis gets damaged from UV ray. As it is deep under the skin, malignant form of melanoma has high chance of spreading to other part of the body.

5. Which of the following are functions of the integumentary system? Select all that apply.

Correct Options: Sensory perception, Thermoregulation, Water Balance, and Protection

Note: Intergumentary system is a set of organs including skin, hair, nail, and endocrine glands. It has huge role in protection, thermal regulation by radiation, excretion through sweat and sebum, sensation via sensory receptors, chemical synthesis of vitamin D etc.

6. Which of the following is not an effect of aging on the skin?

Correct Option: Dry Hair

Note: With age, skin gets easily bruised due to thinner blood vessels wall, also skin develops irregular shaped benign moles and as the sebum and sweat glands decline with age, decreased sweating is also seen. But dry hair is not part of aging of skin.