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15 Cards in this Set

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difusion
the movement of a substance from a area of high cocentration to low concentration caused by the random motion of particles in a substance
active transport
requries the cell to move energy because the substance is being moved against the concentration gradient
passive trasport
movment across the cell membrane no enerygy
osmosis
the diffusion of water through a slectivly permeable membrane
what makes the cell membrane selectivly permeable
proteins
phospolipids
a lipid made of a phosphate group and two fatty acids- head polar and is atracted to water forming a weak bond
homeostastis
mantains this by alowing some substances to move across the cell membrane
faclitated diffusion
a protien used to transport spesific substances like amino acids and sugars called carrier protien do not use the cells energy
3 osmosis
hpertonic, hypotonic, isotonic
hypotonic
the fluid outside the cell has a lower concertration of dissolved particles which means the cell has less water in it
hypertonic
the fluid outside the cell has a higher concentration of dissolved particles then inside the cell
endocytosis
the movement of a substance into a cell by a vesticle is called
sodium potasium pump
sodium atracts water so it pumps sodium out and potasium in which atracts glucose
receptor proteins
1. changes in permeablity
2. second messangers
3. enzyme action
excosytosis
the movement of a substace by a vesicle to the outside of a cell