Vitamin D: Sources, Metabolism, and Function Quiz

Sunlight exposure triggers vitamin D synthesis in the skin.

Vitamin D enhances the absorption of calcium in the intestines.

Milk is often fortified with vitamin D, making it a dietary source.

Vitamin D synthesis occurs primarily in the skin upon exposure to sunlight.

Calcitriol is the metabolically active form of vitamin D.

Photolysis is the process by which UV radiation converts 7-dehydrocholesterol to previtamin D3 in the skin.

Excessive vitamin D intake can lead to hypervitaminosis D, characterized by elevated blood calcium levels.

UV-B radiation penetrates the skin and triggers vitamin D synthesis.

Older adults are at higher risk of vitamin D deficiency due to reduced skin synthesis and dietary intake.

Rickets is a bone disorder resulting from vitamin D deficiency in children.

Vitamin D promotes the mineralization of bones, essential for bone strength.

Vitamin K works synergistically with vitamin D to ensure proper calcium metabolism.

Conversion of vitamin D to calcitriol primarily occurs in the endoplasmic reticulum of cells.

Health authorities recommend limiting vitamin D intake to 10000 IU per day to prevent toxicity.

Parathyroid hormone stimulates the kidneys to produce the active form of vitamin D.