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Chapter 3

Cellular Transport Mechanisms- Movement across the Cell Membrane

QuestionAnswer
movement from high to low concentration diffusion
move from high to low concentration, passive transport, no energy needed simple diffusion
diffusion through protein channels, channels move specific molecules across cell membrane, no energy needed facilitated diffusion
Cells may need to move molecules against concentration gradient, conformational shape change transports solute from one side of membrane to other, protein “pump”, “costs” energy = ATP active transport
material can go in endocytosis
"cellular eating", vesicles holds a solid substance phagocytosis
"cellular drinking", vesicle contains a liquid material pinocytosis
materials can go out exocytosis
molecule can bind to the surface of the membrane receptor-mediated endocytosis
diffusions of water from high concentration of water to low concentration of water across a semi-permeable membrane osmosis
more solute, less water hypertonic
less solute, more water hypotonic
equal solute, equal water isotonic
cell survival depends on balancing ____ & ____ water uptake; loss
a cell is hypotonic if it is in high concentration of water, a good example is ____ a cell in freshwater
helps the cell to pump water out of cell to avoid the cell swelling and bursting from gaining water contractile vacuole
a cell is hypertonic if it is in low concentration of water, a good example is _____ a cell in salt water
a solution to cell losing water and dying a low concentration water take up water or pump out salt
animal cell immersed in mild salt solution, cell in equilibrium isotonic
Created by: yuniskie
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