Most of our cells are surrounded by

Options

A. blood
B. fluid equivalent to seawater in salt composition
C. interstitial fluid
D. pure water

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what surrounds most of our cells. This requires knowledge of the fluids present in the body and their functions.

2. **Defining Extracellular Fluid**: All fluids outside the cells are collectively referred to as extracellular fluid. This includes various types of fluids that play a role in cellular environment and communication.

3. **Identifying Components of Extracellular Fluid**: The extracellular fluid is primarily composed of interstitial fluid and plasma. Interstitial fluid is the fluid that directly surrounds the cells, while plasma is the liquid component of blood.

4. **Role of Interstitial Fluid**: Interstitial fluid surrounds each cell and provides a medium for the exchange of nutrients, waste, and other substances between the blood and the cells.

5. **Analyzing the Options**:
- **Option 1: Blood** - This is incorrect because while blood is important, it does not directly surround the cells.
- **Option 2: Fluid equivalent to seawater in salt composition** - This is also incorrect as it does not accurately describe the fluid surrounding cells.
- **Option 3: Interstitial fluid** - This is correct as it is the fluid that surrounds most cells.
- **Option 4: Pure water** - This is incorrect since cells are not surrounded by pure water but by interstitial fluid.

6. **Conclusion**: The correct answer is that most of our cells are surrounded by interstitial fluid.

**Final Answer**: Most of our cells are surrounded by interstitial fluid.

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