Aldosterone
Definition
Aldosterone is a steroid hormone produced by the adrenal cortex. It plays a crucial role in regulating sodium and potassium levels in the blood, thereby controlling blood pressure and fluid balance.
5 Must Know Facts For Your Next Test
- Aldosterone is part of the renin-angiotensin-aldosterone system (RAAS) that regulates blood pressure.
- It promotes sodium reabsorption and potassium excretion in the kidneys.
- Aldosterone secretion is stimulated by low blood pressure, low sodium levels, and high potassium levels.
- Hyperaldosteronism can lead to hypertension, while hypoaldosteronism can result in low blood pressure and high potassium levels.
- Its action is counterbalanced by atrial natriuretic peptide (ANP), which reduces blood volume.
Review Questions
- What triggers the release of aldosterone?
- How does aldosterone affect kidney function?
- What are the consequences of hyperaldosteronism?
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Related terms
Cortisol: A steroid hormone also produced by the adrenal cortex that regulates metabolism and stress response.
Renin: An enzyme secreted by the kidneys that initiates the RAAS pathway to regulate blood pressure.
Angiotensin II: A peptide hormone that constricts blood vessels and stimulates aldosterone release to increase blood pressure.
