Most of our cells are surrounded by

Options

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

Answer

To answer the question "Most of our cells are surrounded by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cell Surroundings**: Begin by recognizing that cells are not isolated entities; they exist in a fluid environment. The fluid that surrounds cells is crucial for various physiological processes.

2. **Defining Extracellular Fluid**: The fluid outside the cells is collectively known as extracellular fluid. This includes all fluids found outside the cells, which are essential for nutrient transport and waste removal.

3. **Identifying Components of Extracellular Fluid**: Extracellular fluid can be further divided into two main components:
- **Interstitial Fluid**: This is the fluid that directly surrounds the cells, providing a medium for the exchange of substances between the blood and cells.
- **Plasma**: This is the liquid component of blood, which also plays a role in transporting nutrients, gases, and waste products.

4. **Understanding the Relationship**: Interstitial fluid and plasma are interconnected. Plasma communicates with interstitial fluid through the capillary membranes, allowing for the exchange of materials.

5. **Conclusion**: Given the options provided, the correct answer to the question 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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