What will happen when human RBCs are placed in 2% NaCl solution?

Explanation

**Step-by-Step Solution:**

1. **Understanding Red Blood Cells (RBCs):**
- Human RBCs are responsible for the transport of gases, primarily oxygen and carbon dioxide, due to the presence of hemoglobin, an iron-containing pigment.

2. **Identifying the Concentration of RBCs:**
- The normal concentration of solutes in human RBCs is approximately 0.9% (isotonic solution). This means that when RBCs are placed in a solution with the same concentration, there is no net movement of water, and their size remains unchanged.

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