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Describe the sequence of structures through which a drop of urine passes from the time it...

Describe the sequence of structures through which a drop of urine passes from the time it flows from the nephron until it reaches the urinary bladder. B) At which point is the the majority of water reabsorbed? At which point(s) is sodium reabsorbed? Where does ADH and aldosterone exert their actions?

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Answer #1

A. Urine flows from the tubles of a nephron to collecting duct. Collecting ducts of many nephrons join to form ureter. So then urine flows out of the kidney into the ureter through renal pelvis. Ureter drains the urine into the urinary bladder.

B. Water is mainly reabsorbed in the proximal convoluted tubule of nephrons. Water is reabsorbed in the PCT by osmosis from high water potential to low water potential.

Most of the sodium is reabsorbed in PCT alongwith water reabsorption. About 70% is absorbed here itself. The remaining Na+ is reabsorbed in the ascending limb of loop of Henle and distal convoluted tubule.

ADH increases water reabsorption by acting on distal convoluted tubules and collecting ducts thereby regulate the osmolarityof urine.

Aldosterone acts mainly on the collecting duct of nephrons to increase Na+ reabsorption and K+excretion.

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