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Tonicity and Osmoregulation

AP Biology· difficulty 2/5

isotonic hypotonic hypertonic

A red blood cell in a hypotonic solution

  • A

    Stays normal (no net water movement); shape held

  • B

    Swells (water moves in by osmosis); may lyse

    check_circle
  • C

    Becomes turgid (water in against cell wall); no lysis

  • D

    Shrinks (water moves out by osmosis); may crenate

Explanation

Hypotonic surroundings → water flows into the cell. Animal cells have no wall, so excessive swelling causes lysis.

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