Name the process through which much needed oxygen is supplied to all the cells of body ?

Options

A. Diffusion
B. Endosmosis
C. Exosmosis
D. Counter current

Answer

To answer the question about the process through which much-needed oxygen is supplied to all the cells of the body, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Requirement**: The question asks for the process that supplies oxygen to all cells in the body. Oxygen is essential for cellular respiration, which is how cells generate energy.

2. **Identifying the Possible Processes**: The options mentioned include diffusion, osmosis, exosmosis, and counter current. We need to analyze these processes to determine which one is responsible for oxygen transport.

3. **Analyzing Diffusion**:
- Diffusion is a passive process where molecules move from an area of higher concentration to an area of lower concentration.
- In the context of oxygen, it moves from the lungs (where oxygen concentration is high) into the bloodstream (where oxygen concentration is lower) and then into the cells.

4. **Considering Other Processes**:
- **Osmosis**: This specifically refers to the movement of water across a semipermeable membrane and is not directly related to oxygen transport.
- **Exosmosis**: This is the process of water moving out of a cell, which again does not pertain to oxygen supply.
- **Counter Current**: This refers to the exchange of substances in opposite directions, often seen in fish gills for gas exchange, but it is not the primary process for oxygen delivery in the human body.

5. **Conclusion**: The correct process through which oxygen is supplied to all cells in the body is **diffusion**. It allows oxygen to move from areas of higher concentration (lungs) to areas of lower concentration (cells).

### Final Answer:
The process through which much-needed oxygen is supplied to all the cells of the body is **Diffusion**.

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