Trace the flow of a water molecule through the nephrons from the afferent arteriole to the minor calyx
What will be an ideal response
The water would flow from the afferent arteriole into the glomerulus, where it would be filtered into the Bowman's capsule. From the Bowman's capsule, it would enter the proximal convoluted tubule (PCT). Most of its companion water molecules would be reabsorbed into the blood from the PCT. The next part of the trip would take the water molecule through the descending of the nephron loop, where more of its companion water molecules would be reabsorbed. From there, the water molecule would climb the ascending nephron loop and move into the distal convoluted tubule (DCT). Toward the end of the DCT and most of the collecting duct, there are principal cells that respond to ADH and can reabsorb more water molecules. If not reabsorbed in the DCT or the collecting duct, the water molecule would move into the papillary duct that drains into the minor calyx.
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