Write short note on plasma.

Explanation

### Step-by-Step Solution:

1. **Definition of Plasma**: Plasma is the liquid component of blood that remains after the removal of blood cells (RBCs, WBCs, and platelets). It constitutes about 55% of total blood volume.

2. **Appearance and Characteristics**: Plasma is described as a straw-colored, alkaline, and viscous fluid. This characteristic color and consistency are important for its function in the body.

3. **Composition of Plasma**:
- **Water Content**: Plasma is composed of approximately 90-92% water, which serves as a solvent for various substances.
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