Mineralocorticoids, including aldosterone, are able to maintain blood pressure during times of stress. Which of the following is not an effect of aldosterone?
Correct answer: A. Decreased blood sodium levels
- A. Decreased blood sodium levels
- B. Decreased urine sodium content
- C. Decreased blood potassium levels
- D. Increased blood pressure
Explanation
The mineralocorticoid aldosterone is stimulated by the renin-angiotensin system of the kidney when blood volume falls. Aldosterone acts at the distal convoluted tubule of the kidney to increase sodium reabsorption, thus raising sodium levels in the blood and lowering sodium levels in the urine. Aldosterone also increases potassium excretion, thus causing low levels of potassium in the blood. The overall retention of sodium draws water from the filtrate into the blood, causing increased blood pressure by increasing blood volume.
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About Chemical Coordination and Hormones
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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