I need help with all three questions please! 1. Choose all that apply: The skin

Question

I need help with all three questions please!

1. Choose all that apply: The skin pigment melanin

is the source of skin pigmentation.

protects DNA from damaging effects of UV light.

provides immune defense in the epidermal layer.

is secreted onto the skin surface to protect from sun damage.

is necessary for the production of vitamin D by the skin.

2. Which of the following is NOT a homeostatic contribution of the skin?

Thermoregulation

Helps to activate Vitamin D

Stores vitamin D

Provides sensory input to the brain

Provides a reservoir for blood

3.

Constant exposure of skin to friction stimulates the formation of a [______], which is an abnormal thickening of the stratum corneum. Note: spelling counts!

is the source of skin pigmentation.

protects DNA from damaging effects of UV light.

provides immune defense in the epidermal layer.

is secreted onto the skin surface to protect from sun damage.

is necessary for the production of vitamin D by the skin.

Explanation / Answer

1. The skin pigment melanin

true :

a. is the source of skin pigmentation.

b. protects DNA from damaging effects of UV light.

c. provides immune defense in the epidermal layer - it provides innate immunity against bacteria and fungal proliferation in the epidermal and dermal layers.

e. is necessary for the production of vitamin D by the skin- a small amount of pigmentation is necessary.

false:

d. is secreted onto the skin surface to protect from sun damage.

Keratinocytes or squamous cells are in the middle layer of the epidermis and produce keratin, the protein that forms the protective outer layer.

2. NOT a homeostatic contribution of the skin?

b. Helps to activate Vitamin D - An inactive form of vitamin D (vitamin D3) is from in the skin from cholesterol by the action of UV light

c. Stores vitamin D - it is stored in the liver and fatty tissues.

3. Constant exposure of skin to friction stimulates the formation of a callus, which is an abnormal thickening of the stratum corneum.

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