Endocrinology/VasopressinADH/ControlToWaterIntake/basic

POINT!

With sweating, the (blue→red) negative feedback facilitates (the synthesis, secretion, and blood concentration of) vasopressin (anti-diuretic hormone, ADH).

ファイル:WaterIntakeBeforeBasicFeedbackToADH.jpg

① Sweating increases plasma osmolarity, and reabsorption (through the water channels, which are increased by vasopressin, ADH) decreases plasma osmolarity. These effects are in the opposite direction (blue).

ファイル:WaterIntakeDuringBasicFeedbackToADH.jpg

② Since the effects of these two are in the opposite direction (blue), negative feedback facilitates (red) (the synthesis, secretion, and blood concentration of) vasopressin (anti-diuretic hormone, ADH). This increases the number of water channels and the reabsorption of water. The plasma osmolarity-decreasing effect of the reabsorption increases, and the plasma osmolarity becomes adequate.

Challenge Quiz

1.

Sweating increases decreases  正解! plasma osmolarity, and reabsorption (through the water channels, which are increased by vasopressin, ADH) increases decreases  正解! plasma osmolarity. Since these effects are in the same opposite  正解! direction, with sweating, negative feedback facilitates inhibits  正解! (the synthesis, secretion, and blood concentration of) vasopressin (anti-diuretic hormone, ADH).