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

Options

A. Equilibrium 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 the Role of Kidneys:**
- The kidneys are vital organs in the human body that perform two main functions: excretion of waste products and regulation of various physiological parameters.

2. **Excretion of Waste Products:**
- The primary function of the kidneys is to filter waste products from the blood, which are then excreted as urine. This includes urea, creatinine, and other metabolic wastes.

3. **Osmoregulation:**
- In addition to waste removal, the kidneys are crucial for osmoregulation. This means they help maintain the balance of water and electrolytes in the body.

4. **Maintaining Constant Composition of Blood:**
- The kidneys ensure that the composition of blood remains constant despite variations in diet or fluid intake. This is achieved through processes such as reabsorption and secretion.

5. **Reabsorption and Secretion:**
- As blood passes through the nephron (the functional unit of the kidney), essential substances like glucose, amino acids, and certain ions are reabsorbed back into the bloodstream. At the same time, excess ions and waste products are secreted into the tubular fluid for excretion.

6. **Conclusion:**
- Therefore, the kidneys play a crucial role in maintaining the constant composition of blood irrespective of the nature of food or fluid intake. This is the correct answer to the question posed.

**Final Answer:**
The kidneys not only remove waste products from the blood but also play a very important role in maintaining the constant composition of the blood irrespective of the nature of food or fluid intake.

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