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19 Cards in this Set
- Front
- Back
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What is the Plasma Membrane? |
- Thin, flexible boundary between the cell and its environment - Allows nutrients to enter the cell - Allows wastes to leave cell |
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Plasma Membrane - Phospholipid Layer |
- lipid molecules with 2 fatty acid tails and a phosphate group - makes up the majority of the plasma membrane |
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Plasma Membrane - Proteins |
- Transmit signals inside the cell - Act as a support structure - Provide pathways for substances to enter and leave the cell |
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Plasma Membrane - Cholesterol |
- Prevents fatty acid tails from sticking together - keeps the membrane fluid |
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Plasma Membrane - carbohydrates |
- identify chemical signals from other cells |
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Fluid Mosaic Model |
Other molecules (proteins, carbs, etc...) move and float around in the Phospholipids like tiles in a mosaic |
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Plasma Membrane - Selective Permeability |
- Allowing certain substances to enter the cell while keeping others out - ex. Spaghetti strainer |
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Plasma Membrane - Passive Transport |
- Movement of particles across the cell membrane without using energy 3 types - Diffusion - Facilitated diffusion - Osmosis |
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Plasma Membrane - Passive Transport - Diffusion |
- movement of particles from an area of high concentration to an area of low concentration - diffusion occurs unTil concentrations are equal inSide and outside of the cell - molecules continue to move but concentration remains equal - ex. Food coloring and water |
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Plasma Membrane - Passive Transport - Facilitated Diffusion |
- movement of materials across the membrane using proteins - Channel proteins - Carrier proteins |
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Plasma Membrane - Passive Transport - Facilitated diffusion - channel proteins |
- proteins act as channels through the membrane allowing specific materials to pass through |
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Plasma Membrane - Passive Transport - Facilitated diffusion - carrier proteins |
- proteins that change shape to allow certain materials to pass through |
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Plasma Membrane - Passive Transport - Osmosis |
- Diffusion of water across a selectively permeable membrane 3 types - isotonic - hypotonic - hypertonic
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Plasma Membrane - Passive Transport - osmotic solutions - isotonic solution |
- solute concentration is equal I'm and out of the cell - water travels into and out of the cell at the same rate - normal size cell |
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Plasma Membrane - Passive Transport - osmotic solutions - hypotonic solution |
- initial water solute concentration is higher inside the cell - water diffuses into the cell faster than it diffuses out of the cell to equalize concentration - cell enlarges because of water diffusion |
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Plasma Membrane - Passive Transport - osmotic solutions - hypertonic solution |
- initial solute concentration is higher outside of the cell - water diffuses out of the cell faster than it diffuses into the cell to equalize concentration - cell shrinks because of water diffusion |
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Plasma Membrane - active transport |
- movement of particles across the cell membrane against the concentration gradient - moves from areas of lower concentration to areas of higher concentration - requires energy |
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Plasma Membrane - Movement of Large particles - endocytosis |
- plasma membrane surrounds large food particle - turns into a vacuous that stores the food |
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Plasma Membrane - Movement of Large particles - exocytosis |
- vesicles contains the waste - fuses with the cell membrane - waste is released outside of the cell |
