alleryStart learning →Which change triggers the release of aldosterone?
AA rise in blood sodium levels
BA rise in plasma protein levels
CA rise in blood potassium levels
DA rise in systemic blood pressure
Answer & Solution
Correct answer: C. A rise in blood potassium levels
1. Aldosterone conserves sodium and water and drives potassium out into the urine.
2. It is released when blood potassium rises, when blood sodium falls severely, or when blood pressure falls.
3. A rise in blood potassium therefore triggers it.
4. A rise in blood sodium does the reverse, since raised extracellular osmolality inhibits release.
5. Falling blood pressure, not rising pressure, is the pressure trigger.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", section Aldosterone_
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