Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam

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A red blood cell is placed in an aqueous solution of 0.3 M NaCl. Assuming normal intracellular osmolarity is equivalent to 0.15 M NaCl (~0.3 Osm/L), what physiological phenomenon will occur?

Water exits the cell by osmosis, causing crenation. Water enters the cell by osmosis, leading to hemolysis. Na+ ions rapidly diffuse into the cell, resulting in turgor. No net movement of water occurs because the solution is isotonic.

Correct Answer:

Water exits the cell by osmosis, causing crenation.

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