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Membranes 4A

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Unit Membrane   a thin structure composed of proteins and lipids type of membrane found around all cells and around many of the structures inside cells Membranes form the outer boundary of a cell.  
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selectively permeable   important property of a unit membrane. Means that certain molecules go through them and other molecules do not  
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what easily passes through most membranes   water, oxygen and carbon dioxide  
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how does a substance pass through a unit membrane   passive transport or active transport  
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what are two main ways of passive transport   diffusion osmosis  
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passive transport is   the passage of substances across a membrane without the use of energy  
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diffusion   the movement of molecules from an area of higher concentration to an area of lower concentration  
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what can accelerate diffusion   heat,movement and pressure  
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osmosis is   the diffusion of water through a membrane  
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active transport is   the passage of particles through a membrane; requires the use of cellular energy (sometimes because of the size of the molecule being so large, or going against gradient)  
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What are some substances that are carried into and out of cells using active transport   calcium, potassium, sodium  
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