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BIOLOGICAL MEMBRANES : - Coggle Diagram
BIOLOGICAL MEMBRANES :
facilitated diffusion
two membrane proteins
carrier - moves larger molecules down the concentration gradient by having the molecule attach to the protein and changes its shape to then release the molecule on the opposite side
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passive
diffusion
definition: the net movement of particles across a partially permeable down the concentration gradient
molecules diffuse both ways, but the net movement will be to the lower are of concentration
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osmosis
definition: diffusion of water molecules across a partially permeable membrane down a concentration gradient
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solutions
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hypertonic
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plant cell: becomes flaccid and the plasma membrane will eventually be pulled away from the cell wall (plasmolysis)
signalling
cells need to communicate with each other to control all processes inside of the body and respond to changes in the environment
messenger molecules are detected by the cell after its binding to a receptor on its plasma membrane and triggers a series of chemical signal to make changes in the cell
cell membrane
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components
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proteins
carrier - larger, charged particles
channel - small, charged particles
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function
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plasma membranes allow a barrier between the cell and its environment and so substances can cross via diffusion, osmosis and active transport
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organelle membranes also separate the inside of an organelle fro the environment of the cytoplasm and can form vesicles to transport substances around the cell
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active
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exocytosis
substances produced by the cell need to be released using vesicles to transfer them either straight to the plasma membrane or out of the cell
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