How would the hypothalamus respond if its osmoreceptors noticed an increase in plasma osmotic pressure? It would send a message to:

The posterior pituitary to release more ADH
The posterior pituitary to release less ADH
The adrenal cortex to release less aldosterone
The atria to release more ANP
The posterior pituitary to release more ADH  The hypothalamus would respond in a way that opposed the rise in osmotic pressure. Releasing more ADH would make the distal convoluted tubules of the nephrons to become more permeable to water. This would allow more water to be reclaimed from the filtrate which would act against the osmotic pressure of the plasma from rising further. It would also stimulate thirst.

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