🧪 Unit 1: Chemistry of Life
1.3Introduction to Biological Macromolecules
1.4Properties of Biological Macromolecules
1.5Structure and Function of Biological Macromolecules
🧬 Unit 2: Cell Structure and Function
2.1Cell Structure: Subcellular Components
🔋 Unit 3: Cellular Energetics
🦠 Unit 4: Cell Communication and Cell Cycle
4.0Unit 4 Overview: Cell Communication and Cell Cycle
4.2Introduction to Signal Transduction
👪 Unit 5: Heredity
👻 Unit 6: Gene Expression and Regulation
🦍 Unit 7: Natural Selection
🌲 Unit 8: Ecology
8.4Effect of Density of Populations
👏 General Review
✍️ Free Response Questions (FRQ)
Biology Short Essay Free Response Questions
🧐 Multiple Choice Questions (MCQ)
Biology Multiple Choice Questions
⏱️ 2 min read
June 8, 2020
The movement of water inside and out of the cell is essential to it's survival. Water, just like all other substances, travels from a higher concentration of itself to a lower concentration of itself. This movement can have large impacts on the cell.
Depending on the amount of material outside of a cell compared to inside, the environment outside of a cell can be hypotonic, hypertonic or isotonic to the internal environment of a cell.
A hypotonic solution is one that has LESS solute than the inside of the cell. In this case, water will move to where there is MORE solute (and therefore less water!). Water will move into the cell, causing the cell to expand. **think HYPO- HIPPO**🦛
A hypertonic solution is one that has MORE solute in it than there is inside of the cell. In this case, water will still move to where there is MORE solute. Water will, therefore, move out of the cell, causing the cell to shrink. **think: when you’re HYPER you run outside** 🏃♀️An isotonic solution is one that has EQUAL solute in it to that of the cell. In this case, water moves equally in and out of the cell, with no net movement. The cell does not change shape. 💧 Water will attempt to move from an area of high concentration to an area of low concentration until there are equal amounts of water on both sides of the membrane. This is called osmosis. Osmosis allows organisms to control their internal solute composition and water potential.
Below are examples of hypertonic, isotonic, and hypotonic solutions for both a blood cell and a plant cell. As you can see, plant cells are more able to exist in a hypotonic environment due to their cell wall.
Image courtesy of Wikipedia
Image courtesy of Wikipedia
⚡ Watch: AP Biology - Tonicity & Osmoregulation
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