Question

vitamin d is unique among the vitamins because
multiple choice
it is absorbed and transported via the lymphatic system.
absorption requires bile and fat.
it can be formed in the body when skin is exposed to sunlight.
it can be stored in adipose tissue

Explanation:

Vitamin D is unique among vitamins because it can be synthesized in the body. When the skin is exposed to sunlight (specifically ultraviolet B rays), a chemical reaction occurs. Cholesterol in the skin is converted into a precursor of vitamin D. This precursor then undergoes further changes in the liver and kidneys to become the active form of vitamin D. Other vitamins are typically obtained only through dietary intake (except for some B - vitamins that can be produced by gut bacteria to a limited extent).

• The first option (absorbed and transported via the lymphatic system) is a property of fat - soluble vitamins (including vitamins A, D, E, K), so it is not unique to vitamin D.
• The second option (absorption requires bile and fat) is also a characteristic of fat - soluble vitamins, not unique to vitamin D.
• The fourth option (can be stored in adipose tissue) is a property of fat - soluble vitamins in general.

Answer:

It can be formed in the body when skin is exposed to sunlight.