Consider the following statements 1 Vitamin D is the principle regulator of Calcium i...........

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Consider the following statements:

1) Vitamin D is the principle regulator of Calcium in the body

2) The body synthesizes vitamin D when exposed to sunlight

Which of the above statements is/are correct?

1 Only

2 Only

Both 1 and 2

Neither 1 nor 2

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Explanation:

The parathyroid hormone (PTH), secreted by the parathyroid glands, is responsible for regulating blood calcium levels; it is released whenever blood calcium levels are low. PTH increases blood calcium levels by stimulating osteoclasts, which break down bone to release calcium into the blood stream
Vitamin D refers to a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, phosphate, and zinc. In humans, the most important compounds in this group are vitamin D3 and vitamin D2.

The skin is responsible for producing vitamin D. During exposure to sunlight, ultraviolet radiation penetrates into the epidermis and photolyzes provitamin D3 to previtamin D3. Previtamin D3 can either isomerize to vitamin D3 or be photolyzed to lymisterol and tachysterol.