In the membrane of human RBC the percentage of lipid is approximately:-

Answer

To determine the approximate percentage of lipids in the membrane of human red blood cells (RBCs), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Composition of Cell Membrane**:
- The cell membrane of human RBCs is composed of lipids, proteins, and oligosaccharides.

2. **Referencing the Fluid Mosaic Model**:
- According to the fluid mosaic model proposed by Singer and Nicholson, the cell membrane is structured as a lipid bilayer with proteins embedded within it.

3. **Identifying the Components**:
- In the membrane, the main components are:
- Lipids
- Proteins
- Oligosaccharides (sugars)

4. **Percentage Breakdown**:
- The approximate percentages of these components in the membrane are:
- Proteins: 52%
- Lipids: 40%
- Oligosaccharides: 8%

5. **Conclusion**:
- Therefore, the approximate percentage of lipids in the membrane of human RBCs is **40%**.

### Final Answer:
The percentage of lipids in the membrane of human RBCs is approximately **40%**.

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