Remarkable fall in blood pressure affects the normal function of kidneys by reducing

Options

A. Secretion of nitrogenous wastes
B. Renal filtration
C. Reabsorption of useful substances
D. None of these

Answer

To answer the question, "Remarkable fall in blood pressure affects the normal function of kidneys by reducing," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Blood Pressure and Kidney Function**:
- The kidneys play a crucial role in filtering blood and maintaining homeostasis. Blood pressure is essential for the kidneys to perform their functions effectively, particularly in the process of filtration.

2. **Analyzing the Options**:
- **Option 1: Secretion of nitrogenous waste**:
- This option is incorrect. A fall in blood pressure does not directly affect the secretion of nitrogenous waste.

- **Option 2: Renal filtration**:
- This option is correct. A remarkable fall in blood pressure reduces renal filtration. The kidneys filter blood through the glomeruli, and adequate blood pressure is necessary for this filtration process to occur. If blood pressure drops significantly, the glomerular filtration rate (GFR) decreases, leading to reduced filtration of blood.

- **Option 3: Reabsorption of useful substances**:
- This option is incorrect. While reabsorption occurs in the kidneys, a drop in blood pressure primarily affects filtration before it impacts reabsorption.

- **Option 4: None of these**:
- This option is also incorrect since we have identified that renal filtration is affected.

3. **Conclusion**:
- The correct answer is **Option 2: Renal filtration**. A remarkable fall in blood pressure affects the normal function of the kidneys by reducing renal filtration.