Which part of the nephron is impermeable to water?
Question: Which part of the nephron is impermeable to water?
The ascending limb of the loop of Henle is impermeable to water. This means that water cannot pass through the walls of the tubule in this part of the nephron. The ascending limb of the loop of Henle is responsible for the concentration of the urine. The water that is not reabsorbed in the ascending limb of the loop of Henle is passed down to the distal convoluted tubule, where it is reabsorbed.
The other parts of the nephron are permeable to water. The proximal convoluted tubule, the distal convoluted tubule, and the collecting duct all allow water to pass through their walls. This is how the body is able to regulate the amount of water in the blood.
The permeability of the walls of the nephron to water is controlled by a number of factors, including the hormones aldosterone and antidiuretic hormone (ADH). Aldosterone increases the reabsorption of sodium in the distal convoluted tubule and collecting duct. This causes water to be reabsorbed as well. ADH increases the permeability of the walls of the collecting duct to water. This allows more water to be reabsorbed and concentrated in the urine.
The permeability of the nephron to water is an important part of the body's ability to regulate fluid balance. By controlling the amount of water that is reabsorbed, the body can maintain the right amount of water in the blood.
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