A) Aldosterone
B) Thyroxine
C) Adrenalin
D) Calcitonin
Correct Answer: C
Solution :
Adrenalin (epinephrine) is secreted by Chromaffin cells of adrenal medulla. The secretion of adrenalin is directly controlled by the autonomic nervous system, but not under the control of pituitary. Adrenalin is also called 'emergency hormone' because it contributes the 'fright, fight and flight reactions', which occurs in condition of emergency. Increase in emotional disturbance increases the secretion of adrenalin, accelerating the rate of respiration, dilating respiratory passage, increasing blood pressure, heart beat, sugar level and stimulating cellular metabolism. Aldosterone is a mineralocorticoid or salt retaining hormone secreted by adrenal cortex. Its basic function is in conservation of sodium and water and dimination of potassium. Thyroxin (tri-iodothyronin) is manufactured in thyioid gland and is synthesized from iodine. Its main function is to control metabolism, regulating tissue growth and development. Calcitonin or thyrocalcitonin (TCT) is a non-iodised hormone, secreted by para follicular cells of thyroid. Its main role is to lower the amount of calcium and phosphate in the blood.
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