What will happen when R.B.Cs are kept in 0.9% salt solution or 5% glucose solution ?

Answer

### Step-by-Step Solution:

1. **Understanding Red Blood Cells (RBCs)**:
- Red blood cells are crucial components of blood responsible for transporting oxygen throughout the body. They contain hemoglobin, a pigment that binds to oxygen.

2. **Defining Isotonic Solutions**:
- An isotonic solution is one that has the same concentration of solutes as the inside of the cell. In this case, a 0.9% salt solution and a 5% glucose solution are both isotonic to human RBCs.

3. **Effect of Isotonic Solutions on RBCs**:
- When RBCs are placed in an isotonic solution, there is no net movement of water into or out of the cells. This means that the concentration of solutes inside the RBCs is equal to that of the surrounding solution.

4. **Conclusion**:
- Since the solutions are isotonic, RBCs will not undergo any significant change in shape or size. There will be no swelling (as seen in hypotonic solutions) or shrinking (as seen in hypertonic solutions).

5. **Final Answer**:
- When RBCs are kept in a 0.9% salt solution or a 5% glucose solution, there will be no observable change in the RBCs due to the isotonic nature of these solutions.