Calcium absorption from the intestine is promoted by:
A. Vitamin B₁₂
B. Vitamin C
C. Vitamin A
D. Vitamin D
Answer: Option D
Solution (By JKSSB Mock Tests)
Active vitamin D (calcitriol) induces synthesis of calcium-binding proteins in the intestinal mucosa, enhancing calcium absorption. Calcium is vital for bones, teeth, blood clotting, and nerve-muscle function.
Explanation:
Double circulation (pulmonary and systemic) with a four-chambered heart keeps oxygenated and deoxygenated blood separate, increasing efficiency. R correctly explains A.
Explanation:
Beriberi is caused by a severe deficiency of Vitamin B1 (Thiamine). It affects the cardiovascular system (wet beriberi, causing edema and heart failure) and the nervous system (dry beriberi, causing muscle wasting and nerve damage). It is common in populations whose staple diet is polished rice, as the thiamine-rich husk is removed during polishing.
Explanation:
Angiogenesis is the growth of new blood vessels from pre-existing ones, important in development, wound healing, and tumor growth. Vasodilation is widening, vasoconstriction narrowing of vessels. Hematopoiesis is blood cell formation. Inhibiting angiogenesis is a cancer therapy strategy.
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