Water and Kidneys: ADH, Aldosterone
Compliments the diagram handout about homeostasis
what is ADH?
what makes ADH? Where is it stored?
by the hypothalamus, stored in the posterior pituitary
what does ADH do?
causes the reabsorption of H2O from the nephron, to the peritubular capillaries/
what causes headaches?
when the cells of the hypothalamus shrink
how is osmotic homeostasis maintained?
see the osmoregulation handout
What is aldosterone? what is it released by?
a mineralocorticoid, released by the adrenal cortex of the adrenal gland
what does aldosterone cause? t
the increase of Na+ in the blood through increased Na+ reabsorption by the distal tubule, and a collecting duct.
Why is low bp bad?
it reduces the O2 and nutrients being delivered to body cells (because it reduces pressure gradient).
what does renin do?
converts angiotensinogen (a plasma protein) into angiotensin
what is the function of angiotensinogen?
1. stimulates the release of aldosterone
2. causes constriction of blood vessels
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