ADH Flashcards
ADH stands for?
Antidiuretic hormone
What does ADH do?
Stops water potential of blood getting too low by reabsorbing water in the urine into blood
Why would water potential get too low in the blood?
Eating salty foods increases conc of solute so decreases water potential
Sweating
Drinking alcohol
Diuresis
Excessive loss of water in the urine because not enough was reabsorbed
What can detect a decrease in water potential in the blood?
Osmoreceptors
Where are osmoreceptors found?
In the hypothalamus
What happens if osmoreceptors detect a decrease in water potential of the blood?
They are stimulated more
To stimulate the posterior pituitary to release ADH in the bloodstream
What releases ADH in the blood stream?
Posterior pituitary
Does the hypothalamus release ADH?
NO it detects a decrease in water potential of the blood to stimulate the posterior pituitary
Once ADH is released into the bloodstream what happens?
Binds to receptor proteins on cell surface membrane of epithelial cells of distal convoluted tubule and the collecting duct
Once ADH binds to receptor proteins on epithelial cells of distal convoluted tubule/ collecting duct what happens
Increases permeability of the epithelial cells membrane to water by adding aqua portions to the cell surface membrane
Addition of aquaporins to the collecting duct…
Means more water is reabsorbed into blood by osmosis so water moves from urine in collecting duct/DCT into blood over epithelial cell membrane
