Cell Transport
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22 terms
Terms | Definitions |
|---|---|
 Passive Transport | Type of transport that moves materials without using energy |
| Diffusion | A form of passive transport when molecules move naturally move across the membrane from high to low. |
| 2 Factors of Diffusion | 1. Temperature. Higher temperature equal faster rate 2. Size of molecules. Smaller molecules have a faster rate. |
| Osmosis | When water is being passed across the membrane. Still flows from an area of high to low. |
| Flow of water in Osmosis | Water flows from a solution that has a lower concentration solute than to a higher concentration solute |
| Isotonic | Solution is when the concentration of water is equal on both sides of the membrane |
| Hypotonic | Solution is when outside the cell has a high concentration of water than inside the cell |
| Hypertonic | Solution is when inside the cell has a higher concentration of water than outside the cell |
| Facilitated Diffusion | When some molecules are too large to simply pass through the phospholipid bilayer, they need to cross the membrane with the help of transport proteins.Moves molecules from an area of high concentration to an area of low concentration |
| Active Transport | Materials move across the membrane from an area of low concentration to high concentration. It uses energy from the mitochondria. |
| Purpose of Active Transport | THis method of transport is important because it helps to keep materials inside the cell or possibly out of the cell. |
| Bulk Transport | Type of active transport that moves very big molecules across the membrane |
| Endocytosis | When the cell needs to take in large molecules the cell membrane will start to fold around the material forming a pouch. When the material is totally surrounded the membrane pinches off to form a vesicle. |
| Extocytosis | Same process of Endocytosis except it is the movement of molecules from inside the cell to the outside of the cell |
| Plasma Membrane | Boundary that separates the interior of a living cell from its surroundings |
| Semi-Permeable | A plasma membrane is semi-permeable which means that some substances but not all pass through it |
| Molecules that are ABLE to pass through the plasma membrane | Carbon dioxide and oxygen |
| Molecules that are NOT ABLE to pass through the plasma membrane | Sugar |
| Two things cell membranes are composed of | Proteins and phospholipids |
| Hydrophobic | Physical property of a molecule that repels water |
| Hydrophiliac | Physical property of a molecule that attracts water |
| How many layers are there in a cell membrane | 2 therefore the cell membrane is sometimes known as phospholipid bilayer |
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