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Water reabsorption in the distal parts o...

Water reabsorption in the distal parts of kidney tubules is regulated by

A

STH

B

TSH

C

ADH

D

MSH

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the regulation of water reabsorption in the distal parts of the kidney tubules, specifically in the nephron. 2. **Identifying the Relevant Hormones**: The options provided include: - Somatotropic hormone - Thyroid stimulating hormone - Antidiuretic hormone (ADH) - Melanocyte stimulating hormone (MSH) 3. **Focusing on the Nephron**: The nephron is the functional unit of the kidney, and it consists of various parts, including the proximal tubule, loop of Henle, distal tubule, and collecting duct. The distal parts of the nephron are crucial for the regulation of water and electrolyte balance. 4. **Role of Antidiuretic Hormone (ADH)**: Among the hormones listed, ADH is specifically known for its role in regulating water reabsorption. It is produced in the hypothalamus and released from the posterior pituitary gland into the bloodstream. 5. **Mechanism of Action**: When ADH is released, it acts on the distal convoluted tubule and collecting duct of the nephron, increasing the permeability of these tubules to water. This leads to increased water reabsorption back into the bloodstream, thereby reducing urine output and conserving water in the body. 6. **Conclusion**: Based on the function of the hormones and their effects on the kidney, the correct answer to the question is **Antidiuretic Hormone (ADH)**. **Final Answer**: Antidiuretic Hormone (ADH) ---
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the regulation of water reabsorption in the distal parts of the kidney tubules, specifically in the nephron. 2. **Identifying the Relevant Hormones**: The options provided include: - Somatotropic hormone - Thyroid stimulating hormone - Antidiuretic hormone (ADH) ...
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