is what part of the nephron is the most water reabsorbed?
proximal convoluted tubule
how does the loop of Henle work?
within each nephron, in the medulla
descending limb - permeable to water so as filtrate flows down this part of the loop, its water potential decreases
filtrate water potential is lowest at bottom of loop
ascending limb - impermeable to water but allows movement of salts out of filtrate so water potential rises again
what is the function of the loop of henle?
to make an increased salt concentration gradient in the medulla, low water potential, by acting as a countercurrent multiplier to produce concentration gradients, for the reabsorption of water
what are the units used for concentration of solutes in urine?
milliosmoles per kilogram (mosm kg-1) - osmorality
