reabsorption of water Flashcards
what cm3 of fluid is filtered from the blood into nephrons each min
125 cm3
after selective reabsorption, what volume of fluid is left in bladder
1.5cm3
what are the two limbs of the loop of henle
descending and ascending
what occurs in the descending limb
diffusion of sodium and chloride into the descending limb
water leaves descending limb and enters capillaries
what occurs in the ascending limb (bottom part/ basal)
mineral ions leave fluid by diffusion causing a high water potential
what occurs at the top of the ascending limb
mineral ions are actively transported out of the limb into capillaries by ATP. LImb is impermeable here so water cant leave/ enter the limb. Causing a high water potential
what limb is impermeable
ascending limb only towards the top
what is glucose concentration like in the tubule
low as it is selectively reabsorped from pct
how does sodium concentration differ in the tubule fluid
concentration of sodium is high in the descending limb as it is diffusing in
but low in the ascending limb as it is actively pumped out into capillaries
what is urea concentration like
as water is withdrawn from tubule, urea is actively moved in
what is the hairpin counter current multiplier system
describes loop of henle and how the loop increases the efficiency of transferring mineral ions from ascending to descending.
what part of the kidney is the ascending limb heading towards
cortex
what part of the kidney does the loop of henle enter
medulla
where in the kidney is the glomerulus and bowmans capsule found
cortex
what products are an example of excretion
urea
carbon dioxide
