Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

What happens to a human erythrocyte placed in a saline solution that is hypertonic relative to its cytoplasm?

It takes up water by osmosis until it undergoes lysis or hemolysis. It loses water by osmosis to the external medium and undergoes crenation (shriveling). It takes up Na+ ions by simple diffusion, increasing cell volume. It remains unchanged because the membrane is completely impermeable to water.

Correct Answer:

It loses water by osmosis to the external medium and undergoes crenation (shriveling).

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