Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat De Catalunya (Biologia 2n Batxillerat 2026) Exam

Water moves out of the cells by osmosis, causing them to shrink and undergo crenation. Water enters the cells by osmosis until they swell and burst in a process called hemolysis. Sodium ions rapidly diffuse into the cells by simple diffusion, causing cell swelling. The cells maintain a constant volume because the plasma membrane is impermeable to water.