True or false: Aldosterone increases the number of Na+ pumps and channels and thus decreases both Na+ and water reabsorption.True false question.TrueFalse

True or False Evaluation

1. Understanding Aldosterone's Function: Aldosterone is a hormone produced by the adrenal glands that plays a crucial role in regulating sodium and potassium levels in the body. It primarily acts on the kidneys, particularly in the distal convoluted tubules and the collecting ducts.

2. Effects of Aldosterone:

   • Increase in Sodium Reabsorption: Aldosterone promotes the synthesis and activity of sodium (Na⁺) channels (ENaC) and Na⁺-K⁺ ATPase pumps in the kidney tubules.
   • Water Reabsorption: Since water follows sodium due to osmotic gradients, an increase in Na⁺ reabsorption leads to increased water reabsorption as well.

3. Evaluating the Statement: The statement claims that aldosterone decreases both Na⁺ and water reabsorption. This is incorrect because aldosterone's primary role is to increase Na⁺ reabsorption.

Conclusion

The statement is False. Aldosterone increases the number of Na⁺ pumps and channels, leading to increased Na⁺ and water reabsorption, rather than decreasing them.