When the concentration of solutes in the blood (blood osmolarity) is high, the pituitary gland releases antidiuretic hormone(ADH). ADH stimulates the kidneys to reabsorb water in order to increase blood volume and decrease blood osmolarity. A person takes a long hike on a hot day without water. At the end of the day, the hiker drinks enough water to replace what was lost during the hike. Which statement explains the most likely physiological response that the hiker’s body will experience after drinking the water? A. The pituitary gland will secrete ADH because drinking water will cause blood volume to increase, and an increased blood volume will cause the pituitary gland to release more ADH in a positive feedback loop. B. The pituitary gland will stop secreting ADH because drinking water will cause blood volume to increase, and an increased blood volume will cause the pituitary gland to stop releasing ADH in a negative feedback loop. C. The increased blood volume will prevent the release of ADH and cause the kidneys to excrete less water in a negative feedback loop. D. The high blood volume will increase the release of ADH and cause the kidneys to increase reabsorption of water in a positive feedback loop.
13. When the concentration of solutes in the blood (blood osmolarity) is high, the pituitary gland releases antidiuretic hormone(ADH). ADH stimulates the kidneys to reabsorb water in order to increase blood volume and decrease blood osmolarity. A person takes a long hike on a hot day without water. At the end of the day, the hiker drinks enough water to replace what was lost during the hike. Which statement explains the most likely physiological response that the hiker’s body will experience after drinking the water?
A. The pituitary gland will secrete ADH because drinking water will cause blood volume to increase, and an
increased blood volume will cause the pituitary gland to release more ADH in a positive feedback loop.
B. The pituitary gland will stop secreting ADH because drinking water will cause blood volume to increase,
and an increased blood volume will cause the pituitary gland to stop releasing ADH in a negative feedback
loop.
C. The increased blood volume will prevent the release of ADH and cause the kidneys to excrete less water
in a negative feedback loop.
D. The high blood volume will increase the release of ADH and cause the kidneys to increase reabsorption
of water in a positive feedback loop.
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