Biology / Unit 12 Bio 2937 short lesson, about 20 seconds
Aldosterone and the Renin-Angiotensin-Aldosterone System
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The idea
Low blood pressure triggers renin release, which cleaves angiotensinogen to angiotensin I, then converted to angiotensin II, stimulating aldosterone release from the adrenal cortex, enhancing sodium reabsorption and water retention.
In practice
Angiotensin II also acts as a direct vasoconstrictor while stimulating the thirst and ADH responses that raise blood pressure.
Where people slip
Aldosterone regulates sodium and potassium balance specifically, distinct from ADH's direct water-channel mechanism.
Your place on the trail
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