What is the composition of plasma membrane of human erythrocyte.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the composition of the plasma membrane of human erythrocytes (red blood cells).

2. **Identifying Key Components**: The plasma membrane is primarily made up of proteins and lipids. In the case of erythrocytes, hemoglobin is a significant protein that plays a crucial role in oxygen transport.

3. **Determining the Composition**:
- **Proteins**: The plasma membrane of human erythrocytes contains approximately 52% proteins. These proteins are essential for various functions, including transport and structural integrity.
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