Red blood cell in 0.9% saline: isotonic, no net movement

An example figure from the Osmosis and Tonicity generator.

A red blood cell with gray NaCl particles inside in a box of 0.9% NaCl solution with as many particles per space, water arrows going both ways across the membrane labeled No net movement, labeled Isotonic solution, then an arrow to the same normal disc-shaped cell — A red blood cell, 0.9% NaCl inside, in 0.9% saline, the concentration of normal saline drips. Inside and outside are isotonic, so water crosses the membrane equally both ways: no net movement. The cell keeps its normal biconcave shape, drawn pale in the middle.

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Answer key

The solution is isotonic to the cell
No net water movement
The cell stays the same size

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