Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam

What happens to human erythrocytes when they are placed into a hypertonic sodium chloride solution?

They absorb water via osmosis until undergoing osmotic lysis (hemolysis). They lose water via osmosis to the external medium and undergo crenation (shriveling). They take up sodium ions by simple diffusion, causing an increase in cell volume. They remain morphologically unchanged because the cell membrane is completely impermeable to water.

Correct Answer:

They lose water via osmosis to the external medium and undergo crenation (shriveling).

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