Loop of Henle (reabsorption) The epithelial wall of the loop of Henle\'s descend
ID: 219697 • Letter: L
Question
Loop of Henle (reabsorption) The epithelial wall of the loop of Henle's descending arm is freely permeable to water, but is not permeable to salts. Notice that the osmolarity of the interstitial fluid increases from the cortex to the inner medulla, due to increasing concentrations of NaCI and urea. (Note: osmolarity describes the total concentration of solutes in a solution.) > As the filtrate moves down the loop of Henle, what moves across the walls of the nephron and in which direction (in/out of nephron)? Is this the result of passive or active transport? Explain, with reference to permeability and osmolarity. The thinner segment of the loop of Henle's ascending arm is freely permeable to salts, but not permeable to water. >What moves across the walls of this segment of the nephron, and in which direction? Is this the result of passive or active transport? Explain. The thicker segment of the loop of Henle's ascending arm is still impermeable to water, but NaCl is actively transported out of the filtrate as it passes through this segment. ? Why is it necessary for NaCl to be actively transported out of the nephron? In other words, why can't it diffuse out?Explanation / Answer
The filtrate moves down loop of Henle the water moves across the wall of nephrons.
The water moves out of the nephron. passive process. Desending loop highly permeable to water.
At beginning of descending limb it is 300 mOsm per liter. Due to only water permeable water moves out of the tube makes hypertonic as 1200 mOsm per liter in osmolarity.
The filtrate moves up in thinner segment ascending arm Na+ and Cl- moves across the wall of nephrons.
The Na+ and Cl- moves out of the nephron. passive process. Ascending loop highly permeable to Na+ and Cl-
At beginning of ascending limb it is 1200 mOsm per liter. Due to only Na+ and Cl- permeable Na+ and Cl- moves out of the tube makes less hypertonic as 600 mOsm per liter in osmolarity.
The filtrate moves up in thicker segment ascending arm Na+ and Cl- moves across the wall of nephrons.
The Na+ and Cl- moves out of the nephron. Active process. Thicker Ascending loop also highly permeable to Na+ and Cl-
At beginning of thicker ascending limb it is 600 mOsm per liter. Due to only Na+ and Cl- permeable Na+ and Cl- moves out of the tube makes less hypertonic as 300 -100 mOsm per liter in osmolarity.
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