Question

how do longer loops of Henle result in that increased water processing? Hint: think about size and homeostasis,

Answer 1

- In ascending limb sodium ions are actively removed. Ascending limb is impermeable to water. In descending limb sodium ions are diffused in. Descending limb is more permeable to water so water moves out. There's a high concentration of ions in medulla. The longer the loop of henle, the deeper it is into the medulla, the lesser is the water potential due to concentration gradient.

- A longer loop of henle generates a larger concentration gradient, which allows time for production of more concerntrated urine.

- The longer loop of henle will allow time for water to secrete out of loop of henle into the tissue fluid. So water reabsorption increases.