The element that is a component of the oxygen-carrying protein in blood is:
A. Calcium
B. Iron
C. Magnesium
D. Phosphorus
Answer: Option B
Solution (By JKExamLibrary)
Iron is the central atom of heme in hemoglobin, essential for binding oxygen. Magnesium is in chlorophyll, calcium in bones and signaling, phosphorus in ATP and bones.
Explanation:
ADH and oxytocin are synthesized in the hypothalamus and stored/released from the posterior pituitary. Growth hormone and prolactin are anterior pituitary hormones.
Consider the following statements about vitamins:
1. Vitamin C deficiency causes scurvy.
2. Vitamin D deficiency causes beriberi.
3. Vitamin A deficiency causes night blindness.
Which of the above is/are correct?
Explanation:
Scurvy is vitamin C deficiency; night blindness is vitamin A deficiency. Beriberi is due to vitamin B₁ deficiency, not D. So 1 and 3 are correct.
Explanation:
Calcitonin, secreted by parafollicular (C) cells of the thyroid, decreases blood calcium by inhibiting osteoclasts and promoting calcium deposition in bones. Parathyroid hormone (PTH) raises calcium.
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