Osmosis & TonicityATI TEAS 7 cheat sheet

Which way water moves

7 key facts 3 practice questions Reviewed Oct 2026

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Osmosis

Movement of water across a semipermeable membrane
Water moves toward the higher solute concentration
Passive — no ATP required

Isotonic

Equal solute inside and out → no net movement
Normal saline and the cell are balanced

Hypotonic

Less solute outside → water moves IN → cell swells and may burst

Hypertonic

More solute outside → water moves OUT → cell shrinks (crenates)

Key takeaway

Which way water moves

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Question 1 of 3

Osmosis is specifically the diffusion of:

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