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22 Cards in this Set
- Front
- Back
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the plasma membrane..
maintains___________ selective______ ___ bilayer with ____ embedded __ ___ model |
homeostasis
permeability lipid proteins fluid mosaic |
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net movement from hi concentration to low concentration
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diffusion
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means balance ( no movement)
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dynamic equilibrium
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when there is a difference in concentration
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concentration gradient
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diffusion of water from hi to low concentration
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osmosis
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no concentration gradient (no overall change)
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isotonic
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weak solution (pure water) water moves into cell (Swelling)
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hypotonic
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pressure in a cell
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turgor pressure
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remove excess water
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contractile vacuoles
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stron solution (saltwater) water moves of out of cell ( dehydration, wilting(plasmolysis)
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hypertonic
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tube-like; allows small ions to diffuse through them
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channel proteins
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has a shape that fits specific molecules
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carrier proteins
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requires no energy from cell
moves with concentration gradient from low to hi |
passive transport
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requires energy from the cell
moves against concentration gradient low to hi concentration |
active transport
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movement of molecules from hi to low
energy source is kinetic energy ex- O2 |
diffusion
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movement of large molecules from hi to low concentration
source is kinetic energy ex C6H12O6 |
facilitated diffusion
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movement of water from hi to low concentration
source is kinetic energy ex is H2O |
osmosis
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molecules forced out of blood capilaries from hi to low concentration
energy source is fluid pressure or hydrostatic pressure ex are 02 C6H12O6 and H20 |
filtration
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movement of molecules from low to hi
energy source is atp ex amino acids and various ions |
active transport
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membrane acts to engulf very large solids
energy source is atp example is large solids |
phagocytosis (endocytosis)
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membrane acts to engulf liquid
energy source is atp example is liquid |
pinocytosis (endocytosis)
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vesicles form around large molecules
energy source is atp example is large solid and liquid |
exocytosis
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