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Cells Unit

4. Exchange with the Environment

Cell Division Allows organisms to grow and repair injuries.
Where does the exchange of materials between a cell and its environment take place? At the cell membrane.
diffusion the movement of particles from regions of higher density to regions of low density.
osmosis the diffusion of water through a semipermeable membrane. The concentration of particles in blood is kept in check by osmosis.
molecules particles that make up water
Semipermeable only certain substances can pass through the membrane
channels particles cross cell membranes by way of these
Passive Transport the movement of substances across a cell membrane without the use of energy (diffusion and osmosis)
Active Transport the movement of substances across a cell membrane that requires the cell to use energy
small particles move through membranes by diffusion, passive transport and active transport
Large particles move through membranes by endocytosis and exocytosis
endocytosis the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring particle in the cell
vesicles sacs formed from pieces of cell membrane.
exocytosis the process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane.
Created by: 200371966