Question 12

The picture s-19-a.png reflects the effect on red blood cells when plain water is infused into a person.

When plain water is infused into a person, it leads to a hypotonic environment, causing red blood cells to swell and potentially burst due to the influx of water.

A) s-19-a.png

This image accurately depicts the swelling of red blood cells, which occurs when they are placed in a hypotonic solution like plain water. The influx of water into the cells results in an increase in cell volume, illustrating the osmotic effect that plain water has on red blood cells.

B) s-19-b.png

This image likely shows red blood cells in a normal or isotonic state. In an isotonic solution, there is no net movement of water into or out of the cells, which contradicts the scenario of infusing plain water. Therefore, this option does not represent the effect of plain water on red blood cells.

C) s-19-c.png

This image may depict red blood cells that are crenated or shriveled, which occurs in a hypertonic solution where water moves out of the cells. Since plain water infusion creates a hypotonic environment, this option is incorrect as it does not accurately reflect the expected changes in red blood cells.

D) s-19-d.png

This image probably illustrates red blood cells in an abnormal condition unrelated to the effects of plain water infusion. Without evidence of swelling, this representation fails to demonstrate the osmotic effects of hypotonic solutions on red blood cells, making it an incorrect choice.

Conclusion

The correct answer, s-19-a.png, effectively demonstrates the osmotic effect on red blood cells when plain water is infused, leading to cell swelling. All other options fail to depict this physiological response, either showing normal or inappropriate conditions for red blood cells in a hypotonic environment. Thus, s-19-a.png is the only image that accurately reflects the consequences of infusing plain water into a person.