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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