Question

Which hormone(s) is/are required for facultative water reabsorption in the collecting ducts?

Answer 1

ADH hormones are required for facultative water reabsorption in the collecting ducts.

What about facultative water reabsorption?

• The antidiuretic hormone is the hormone in charge of facultative water reabsorption (ADH).
• By enhancing the water permeability of key cells in the collecting duct and the last segment of the distal convoluted tubule, facultative water reabsorption is achieved.
• The proximal convoluted tubule is the initial area of the nephron that is in charge of reabsorbing water.
• The proximal tubule receives filtered fluid from Bowman's capsule.
• Antidiuretic hormone increases the reabsorption of water into the circulation by binding to receptors on cells in the kidney's collecting ducts.
• The collecting ducts are essentially impermeable to water in the absence of antidiuretic hormone, and water escapes as urine.
• In facultative reabsorption, water is reabsorbed through osmosis because the impact of ADH makes the collecting ducts more permeable to water.

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