Question

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what is the function of aldosterone?
acts on the kidneys to increase the secretion of sodium ions from the renal tubules into the urine
triggers the release of glucose from the liver into the bloodstream
promotes the absorption of potassium ions from the bloodstream into the renal tubules
decreases the reabsorption of sodium ions from the renal tubules back into the bloodstream
acts on the kidneys to increase the reabsorption of sodium ions from the renal tubules back into the bloodstream

Explanation:

Aldosterone is a hormone that acts on the kidneys. Its main role is to regulate sodium and potassium levels. It increases the reabsorption of sodium ions from the renal tubules back into the bloodstream. This helps in maintaining the body's fluid balance and blood pressure. Let's analyze each option:

• "Acts on the kidneys to increase the secretion of sodium ions from the renal tubules into the urine": Aldosterone does the opposite. It wants to retain sodium, not secrete it into urine.
• "Triggers the release of glucose from the liver into the bloodstream": This is a function related to other hormones like glucagon, not aldosterone.
• "Promotes the absorption of potassium ions from the bloodstream into the renal tubules": Aldosterone promotes potassium secretion (not absorption) into the renal tubules.
• "Decreases the reabsorption of sodium ions from the renal tubules back into the bloodstream": Again, aldosterone increases sodium reabsorption.
• "Acts on the kidneys to increase the reabsorption of sodium ions from the renal tubules back into the bloodstream": This is correct as per the function of aldosterone.

Answer:

Acts on the kidneys to increase the reabsorption of sodium ions from the renal tubules back into the bloodstream