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Question

Which one of the following is also known as antidiuretic hormone?
(a) Oxytocin (b) Vasopression (c) Adrenaline (d) Calcitonin

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Solution

Vasopressin is also known as antidiuretic Hormone (ADH) it is secreted from the neurohypophysis of pituitary and facilitates water reabsorption from latter parts of the tubule, thereby preventing diuresis.
Oxytocin is a mammalian neurohypophysial hormone produced by the hypothalamus and is stored and secreted by the posterior pituitary gland Oxytocin stimulates contractions of the uterus at the end of pregnancy and also the contraction of mammary glands the help in the flow of milk.
Adrenaline is released by adrenal medulla at the time of emergency, hence has a role in the fight or flight reaction.
Calcitonin is produced in humans primarily by the parafollicular cells of the thyroid. It acts to reduce blood calcium (Ca2+) level opposing the effect of parathyroid hormone.


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