A) Aldosterone
B) Thyroxine
C) Adrenaline
D) Calcitonin
Correct Answer: C
Solution :
Adrenaline (epinephrine) is secreted by chromaffin cells of adrenal medulla. The secretion of adrenaline is directly controlled by the auionomic nervous system, but not under the control of pituitary. Adrenaline is also called 'emergency hormone because it contributes the 'fright, fight or flight reactions' which occurs in condition of emergency. Increase in emotional disturbance increases the secretion of adrenaline, 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 diminarion of potassium. Thyroxine (tri-iodothyronine) is manufactured in thyroid gland and is synthesized from iodine. It's main function is to control metabolism, regulating tissue growth and development, Calcitonin or thyrocalcitonin (TCT) is a non-iodised hormone, secreted by parafollicular cells of thyroid. Its main role is to lower the amount of calcium and phosphate in the blood.
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