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15 Cards in this Set
- Front
- Back
What do cells need to maintain? |
Constant temp., oxygen, pH levels, water concentrations, etc. |
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Homeostasis |
Maintaining balanced internal enviroment |
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Cell membrane |
Semi permeable layer of cell which surrounds the cell and regulates the movement of material into and out of the cell Also called plasma membrane and phospholipid layer |
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Semi permeable |
Only certain materials can flow through |
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Proteins |
Act as a channel or passageway for large materials to move into and out of the cell |
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Phospholipids |
Make up a semipermeable bi layer around the cell Hydrophilic head- attracts water Hydrophobic tail- repels water |
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Concentration Gradient |
Material will always flow for an area of high concentration to low concentration |
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Equillibrium |
The point at which materials are balanced on each side off the gradient |
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Cell Transport |
Moving materials into and out the cell through the cell membrane |
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Passive transport |
Movement of material in/out of the cell which flow with or down the concentration gradient Does not require energy (ATP) |
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Diffusion |
Passive transport The process by which molecules spreads out from an area of high concentration to low concentration |
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Facilitated Diffusion
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Passive transport
Movement of materials using a transport protein in the cell membrane |
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Osomsis |
Passive transport
The diffusion of water across a semi permeable membrane from an area of high concentration to an area of low concentration |
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Active transport |
Movement of materials in/out of the cell which flow against or up the concentration gradient Does not require energy |
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Pumps |
Active transport Use a protein and energy(ATP) to push materials into or out of the cell |