IGNOU MFN 4 2026 2027 - Explain the term calcium homeostasis.b) How tryptophan is converted

Question

Explain the term calcium homeostasis.
b) How tryptophan is converted to niacin? Explain with the help of flow chart.
c) Briefly describe the role of vitamin E and selenium in lipid peroxidation.

17 Jul 2026

Answer :

Word Count : 330

Calcium homeostasis is the process by which the body maintains a constant concentration of calcium in the blood and tissues despite variations in dietary intake. About 99% of body calcium is stored in bones and teeth, while the remaining 1% is present in blood and soft tissues, where it is essential for muscle contraction, nerve impulse transmission, blood clotting, enzyme activity, and cell signaling. Calcium homeostasis is mainly regulated by parathyroid hormone (PTH), calcitriol (active vitamin D), and calcitonin. When blood calcium levels decrease, PTH stimulates bone resorption, increases

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