Controlling blood water potential Flashcards
How is water lost?
Urea
Excretion
Sweat
What is osmoregulation?
The kidney’s regulating the water potential of the blood and urine, so the body has just the right amount of water
What happens when the water potential of the blood is too low?
More water is reabsorbed by osmosis into the blood from the tubules of the nephrons
Urine is more concentrated so less water is lost during excretion
What happens when the water potential of the blood is too high?
Less water is absorbed by osmosis into the blood from the tubules of the nephrons
Urine is more dilute so more water is lost during excretion
Where does the regulation of water potential mainly take place?
Loop of Henle
DCT
Collecting duct
Where is the loop of Henle found?
in the medulla
What is the loop of Henle made up of?
Ascending limb
Descending limb
What do the limbs control the movement of?
Sodium ions
What is actively pumped out at the top of the ascending limb?
Na+ ions are actively pumped out into the medulla
Is the ascending limb permeable or impermeable to water?
impermeable
Where is there a lower water potential, in the medulla or in the descending limb?
In the medulla
Where does water move out of? By what process?
Descending limb
Osmosis
What does the glomerular filtrate become more when the water osmoses out of the descending limb?
More concentrated
Where you water reabsorbed into?
Into the blood through the capillary network
What diffuses out of the ascending limb? Into where?
Na+ ions
The medulla
