The role of the hypothalamus in osmoregulation Flashcards
1
Q
How does the hypothalamus detect a change in water potential?
A
hypothalamus contains osmoreceptors which signal to specialised neurosecretory cells.
2
Q
A fall in water potential leads to…
A
the release of antidiuretic hormone (ADH) from the posterior pituitary
gland.
3
Q
A fall in water potential leads to… (after ADH is released)
A
ADH travels in the blood to the kidneys, attaching to ADH receptors, activating the intracellular enzyme phosphorylase
4
Q
A fall in water potential leads to… (after phosphorylase is activated)
A
vesicles containing aquaporins fuse with the plasma membrane, reducing water loss by increasing the permeability of the collecting duct and distal convoluted tubule.
