The kidney is involved in the reabsorption of solutes and water. A person with hyponatraemia suffers from excessive production of antidiuretic hormone (ADH) from the pituitary gland. This causes changes in the sodium ion concentration of the blood. The table shows the sodium ion concentration of the blood in patients with hyponatraemia. Explain how the excessive release of antidiuretic hormone (ADH) causes these changes in blood sodium concentrations. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No：wbi15-01-que-20240608 Year：2024 Question No：7(c)
Answer:
An explanation that includes three of the following points:
- ADH binds to receptors \{on distal convoluted tubules/ collecting ducts\} (1)
- (causing) aquaporin channels to move (from cytoplasm) into the (apical) membrane of the tubules (1)
- (allowing) water to be reabsorbed out of \{the collecting ducts / distal convoluted tubules\} (1)
- (the water) is reabsorbed into blood / the blood (sodium) ion concentration reduces (1)
- ADH binds to receptors \{on distal convoluted tubules/ collecting ducts\} (1)
- (causing) aquaporin channels to move (from cytoplasm) into the (apical) membrane of the tubules (1)
- (allowing) water to be reabsorbed out of \{the collecting ducts / distal convoluted tubules\} (1)
- (the water) is reabsorbed into blood / the blood (sodium) ion concentration reduces (1)
Knowledge points:
CH7 – Respiration, Muscles and the Internal Environment
Solution:
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