The human kidney `:-`

Options

A. is responsible for the storage of nutrients such as glycogen
B. produces more dilute urine when the collecting ducta become less permeable to water
C. responds to antidiuretic hormone by increasing urine output
D. get rid of urea from the body by secreting it into the descending arm of the loop of Henle.

Answer

To solve the question regarding the functions of the human kidney, we will analyze each option provided and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding the Function of the Kidney**:
- The primary function of the kidneys is to filter blood and produce urine. They help in the excretion of waste products, regulation of water balance, and maintenance of electrolyte levels.

2. **Analyzing Option 1**:
- **Statement**: "Responsible for storage of nutrients such as glycogen."
- **Evaluation**: This statement is incorrect. The liver is primarily responsible for the storage of glycogen, not the kidneys.

3. **Analyzing Option 2**:
- **Statement**: "Produces more dilute urine when collecting ducts become less permeable to water."
- **Evaluation**: This statement is correct. When the collecting ducts are less permeable to water, less water is reabsorbed back into the bloodstream, resulting in more dilute urine.

4. **Analyzing Option 3**:
- **Statement**: "Responds to antidiuretic hormone by increasing urine output."
- **Evaluation**: This statement is incorrect. Antidiuretic hormone (ADH) promotes water reabsorption in the kidneys, leading to decreased urine output, not increased.

5. **Analyzing Option 4**:
- **Statement**: "Get rid of urea from the body by separating it into descending arm of loop of Henle."
- **Evaluation**: This statement is also incorrect. Urea is not separated in the descending arm of the loop of Henle; instead, it is excreted in urine after being filtered from the blood.

6. **Conclusion**:
- After evaluating all options, the correct answer is **Option 2**: "Produces more dilute urine when collecting ducts become less permeable to water."

### Final Answer:
The correct option regarding the human kidney is Option 2.

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