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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What % of the plasma membrane is protein?
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55
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What % of the plasma membrane is lipid bilayer?
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43
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What % of the plasma membrane is carbohydrates (glycocalyx)?
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2
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What function do proteins serve in the cell membrane?
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structural support
transport across the membrane enzymatic control of chemical reactions receptors for hormones and other molecules cellular markers (antigens) which identify |
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lipid bilayer
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highly structured, forms a barrier for movement
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protein
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have big gaps, don't impede movement
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what are requirements for movement that doesn't require energy?
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either small enough to go through pores or lipid soluable
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substances that are lipid soluable are ?
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steroids
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What functions do carbohydrates serve in cell membranes?
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repel negative objects
act as receptors for hormones and others form cell markers which enable cells to aggregate enter into immune reactions regulate tissue growth |
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diffusion
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passive movement of molecules from regions of higher concentration to regions of lower concentration
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requires no energy
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osmosis
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passive movement of solvent molecules through semi permeable membrane due to concentration difference
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requires no energy
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active transport
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molecules or ions are transported through cell membrane by integral membrane proteins from regions of high to low concentration
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ATP required
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pinocytosis
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membrane engulfs minute droplets of fluid from surroundings
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ATP required; cell drinking
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phagocytosis
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membrane engulfs solid particles from surroundings
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ATP required; cell eating
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isotonic
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extracullular concentration=same as intracellular concentration=no osmosis
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hypotonic
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dilute solution, cell swells
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hypertonic
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concentrated, cell shrinks
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endocytosis
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regions of plasma membrane fold into cell that enclose material-pinocyosis and phagocytosis
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exocytosis
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membrane bound vesicles fuse with plasma membrane to release contents outside
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