The kidneys not only remove the waste products from the blood but also play a very important role in maintaining

Options

A. Equlibrium of the body
B. Temperature of the body
C. Constant composition of the blood irrespective of the nature of the food or fluid intake
D. Blood pressure constant

Answer

**Step-by-Step Solution:**

1. **Understanding Kidney Functions**: The kidneys are vital organs that perform multiple functions besides excreting waste products from the blood. They play a crucial role in maintaining homeostasis in the body.

2. **Identifying the Options**: The question provides four options regarding what the kidneys help maintain:
- A) Equilibrium of the body
- B) Temperature of the body
- C) Constant composition of the blood irrespective of the nature of food and fluid intake
- D) Blood pressure constant

3. **Analyzing Each Option**:
- **Option A (Equilibrium of the body)**: This option is incorrect. While the kidneys contribute to homeostasis, they do not specifically maintain equilibrium.
- **Option B (Temperature of the body)**: This option is also incorrect. The kidneys do not directly regulate body temperature.
- **Option C (Constant composition of the blood irrespective of the nature of food and fluid intake)**: This option is correct. The kidneys help maintain the balance of electrolytes, pH, and fluid levels in the blood, ensuring a stable internal environment regardless of dietary changes.
- **Option D (Blood pressure constant)**: This option is incorrect. The kidneys do not keep blood pressure constant; rather, they regulate it by adjusting the volume of blood (through fluid balance) and releasing hormones like renin.

4. **Conclusion**: After analyzing all options, the correct answer is **Option C**, as the kidneys play a significant role in maintaining the constant composition of blood.