Cell Transport

Diffusion Process by which molecules tend to move from an area of high concentration to low concentration

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Homeostasis Process by which organisms maintain a relatively stable internal environment

Semi-Permeable Membrane The outer layer that allows certain substances to pass into & out of a cell

Osmosis Diffusion of water through a selectively permeable membrane

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Isotonic Concentration of particles is the same inside as outside

Isotonic

Hypertonic Solution outside cell has a higher particle concentration than inside cell

Hypertonic

Hypotonic Solution outside cell has a lower particle concentration than inside cell

Hypotonic

osmosis-hypertonic-vs-hypotonic- solution.html

Animal Cells

Plant Cells

Active Transport Transport across a membrane that requires energy

ular-transprot-of-sodium-and-potassium- active-transport

Endocytosis molecules moving “into” a cell forming vesicles Exocytosis molecules moving “out of” a cell from vesicles

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Passive Transport Does NOT require energy to move across a membrane

Facilitated Diffusion Movement of molecules across a membrane via protein channels

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