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Anatomy 1.3
Parts of a cell; Diffusion & Osmosis
| Question | Answer |
|---|---|
| Cell Membrane/Plasma Membrane | The outer lining of the cell. It separates the cell's internal structure from the external environment. |
| Selectively Permeable/Semi-Permeable | The cell membrane permits certain substances to enter and exit the cell which helps maintain the proper environment for the cell to function. |
| Diffusion | The movement of molecules or other particles in solution from an area of greater concentration to an area of lesser concentration until a uniform concentration is reached. |
| Osmosis | The movement of water or solvent through a semi-permeable membrane from an area of higher water or solvent concentration to an area of lower water or solvent concentration. |
| Solution | A homogenous mixture of two or more substances. |
| Homogenous | Pertaining to a solution, the substances are uniformly mixed and distributed. |
| Solvent | The part of a solution present in a great amount, the part that does the dissolving. |
| Solute | The part of a solution present in the lesser amount, the part to be dissolved. |
| What are the two parts of a solution? | Solvent & Solute |
| Osmosis can only occur when the membrane is permeable to ________. | water |
| Biconcave | Indented on both sides (think of life savers) |
| Isotonic Solution | A solution in which the total concentration of water molecules and solute molecules are the same on both sides of the semi-permeable membrane. Certain solutions are isotonic for certain cells. |
| Hypotonic Solution | A solution which has a lower concentration of solutes and higher concentration of solvent or water than the solution with which the cell is compared. |
| Hemolysis | The rupturing of a RBC as a result of hypotonic solution. Water molecules enter the RBC faster than they can leave, causing the cell to swell and burst. |
| Plasmoptysis | The rupturing of a bacterial cell as a result of hypotonic solution. |
| Hypertonic Solution | A solution which has a higher concentration of solutes and a lower concentration of water solvent than the solution with which the cell is compared. |
| Crenation | The shrinking of a blood cell as a result of hypertonic solution. The water molecules move out of the RBC faster than they can enter, causing the cell to shrink. |
| Plasmolysis | The shrinking of a bacterial cell as a result of hypertonic solution. |
Created by:
kellyrb
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