You are prone to sunburn, but you doctor tells you not to apply your sunscreen u

Question

You are prone to sunburn, but you doctor tells you not to apply your sunscreen until you have been outside for five minutes. Why?

Select one:

a. Skin pigmentation, as occurs when you get a light tan, blocks UV radiation and reduces the incidence of skin cancers.

b. Sunlight is necessary for the conversion of cholesterol to vitamin D, a hormone necessary for bone health.

c. Vitamin D in the skin blocks UV radiation, but only for a short period of time; thus, it is a natural sun block.

d. Sunscreen blocks UV radiation necessary for cholesterol synthesis in the skin where it is converted to vitamin D.

e. Sunlight promotes HDL mobilization and a clearing of cholesterol in the blood.

If you were considering designing a drug to regulate blood pressure, which of the following families of steroids would you target?

Select one:

a. glucocorticoids

b. androgens

c. progestogens

d. mineralocorticoids

e. estrogens

Explanation / Answer

the answer to the 1st question:-b, because when our skin is exposed to sunlight UV rays get interacted with a protein called 7-DHC in the skin converting it to vitamin D.

the answer to the 2nd question: -d, i.e aldosterone which is a result of mineralocorticoids, acts on the kidney promoting the reabsorption of sodium ions, so water follows the salt, thus regulating normal blood pressure.

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