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The functioning of kidney is under the control of hormones and juxtaglomerular apparatus. The functioning of kidney is efficiently monitored and regulated by hormonal feedback mechanisms involving the hypothalamus, JGA and to a certain extent, the heart. ' \( X \) ' is secreted by hypothalamus of the brain and released into the blood from the posterior lobe of pituitary gland. It increase the reabsorption of water in the DCT and collecting tubules of kidneys. ' \( Y \) ' is the enzyme secreted by JGA into the bloodstream that changes angiotensinogen to angiotensin II. This hormone constricts the arterioles to increase blood pressure and stimulates DCT to reabsorb more \( \mathrm{NaCl} \) and water by stimulating adrenal glands to release aldosterone. \( Z \) is released from the atria of heart in response to increase in blood volume and pressure.
What is the another name of hormone ' \( \mathrm{X} \) ?
(A) Aldosterone
(B) Renin
(C) Vasopressin
(D) Erythropoietin
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