Question

antidiuretic hormone is: question 3 options: 1) a hormone produced by the adrenal cortex that regulates na+ reabsorption and k+ secretion by the kidneys. 2) hormone produced by the hypothalamus and released by the posterior pituitary. it stimulates the kidneys to reabsorb more water, reducing urine volume. 3) a hormone released by certain cells of the frontal lobe that reduces blood pressure and blood volume by inhibiting nearly all events that promote vasoconstriction and na+ and water retention. 4) a hormone released by certain cells of the heart atria that reduces blood pressure and blood volume by inhibiting nearly all events that promote vasoconstriction and na+ and water retention.

Answer 1

Option 2 is the correct one , Antidiuretic hormone (ADH), which is produced in the hypothalamus and transported to and released from the posterior pituitary gland, is a polypeptide hormone. ADH's main function is to control how much water is expelled by the kidneys.

ADH, sometimes referred to as vasopressin, enables the kidney tubules to directly reabsorb water, which concentrates salts and wastes in the urine that hypothalamus  will eventually be expelled. Either through controlling blood volume or the amount of water in the circulation, the hypothalamus regulates the processes of ADH production. A rise in osmolarity exceeding 300 mOsm/L due to dehydration or physiological stress can increase ADH production and water retention, which in turn elevates blood pressure.

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