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Which description identifies the effect of ADH on the collecting duct of the kidney tubule? A - OCR Gateway - GCSE Biology - Question 11 - 2021 - Paper 1
Question 11
Which description identifies the effect of ADH on the collecting duct of the kidney tubule? A. ADH decreases permeability to water, decreasing reabsorption. B. ADH d... show full transcript
Worked Solution & Example Answer:Which description identifies the effect of ADH on the collecting duct of the kidney tubule? A - OCR Gateway - GCSE Biology - Question 11 - 2021 - Paper 1
Step 1
ADH increases permeability to water, increasing reabsorption.
Answer
The Antidiuretic Hormone (ADH), also known as vasopressin, primarily acts on the collecting ducts of the nephron in the kidneys. When ADH is present, it binds to receptors on the cells in the collecting ducts, which promotes the insertion of aquaporin channels into the apical membrane of these cells. This process increases the permeability of the collecting duct to water, facilitating greater water reabsorption back into the bloodstream. As a result, this action leads to a concentrated urine product and helps to regulate body fluid balance, decreasing urine output.