Plasma cell surface membrane
- Created by: Molly Webb
- Created on: 30-03-15 10:27
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- Plasma cell surface membrane
- Made of a thin layer of lipid (fat) molecules and protein molecules.
- Controls what enters and exits the cell
- the plasma membrane allows small, uncharged particles to pass through
- protein channels and transporters control larger or charged particles
- separates the cells contents from its external environment
- partially permeable
- some organelles inside the cell also are surrounded by a single membrane
- eg) lysosomes
- and some have a double membrane
- eg) the nucleus, mitochondria and chloroplasts
- this isolates the reactions in organelle from that in the cytoplasm
- eg) the nucleus, mitochondria and chloroplasts
- important in cell signalling
- a substance produced- then docks into a receptor in the plasma membrane of another
- allow electrical signals to pass along them
- eg) membrane of the axon of a motor neurone
- this transmits the action potentials from the CNS to a muscles
- eg) membrane of the axon of a motor neurone
- Cholesterol
- lies alongside the phospholipids, making up bilayer
- helps maintain fluidity
- prevents it becoming too stiff in cold temps
- or too fluid in high temps
- helps maintain fluidity
- lies alongside the phospholipids, making up bilayer
- Phospholipid-forms the bilayer
- Provides a BARRIER to water-soluble substances, such as ions and molecules
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