Isotonic

Definition

Isotonic solutions have the same solute concentration as the cell's cytoplasm. Water moves in and out of the cell at equal rates, maintaining cell size.

5 Must Know Facts For Your Next Test

1. Isotonic solutions prevent net movement of water across the cell membrane.
2. Cells maintain their normal shape and function in isotonic solutions.
3. An isotonic environment is crucial for cells to avoid shrinking or swelling.
4. In medical settings, isotonic saline is often used to rehydrate patients without altering cell volume.
5. Osmosis occurs but with no net water movement in an isotonic solution.

Review Questions

• What happens to a cell placed in an isotonic solution?
• Why are isotonic solutions important for cellular function?
• How does an isotonic solution affect osmosis?

Related terms

Hypotonic: A solution with a lower solute concentration compared to the cell's cytoplasm, causing cells to swell.

Hypertonic: A solution with a higher solute concentration compared to the cell's cytoplasm, causing cells to shrink.

Osmosis:

The passive movement of water molecules across a semi-permeable membrane from an area of low solute concentration to high solute concentration.