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Unformatted text preview: 4. Selective permeability in membranes Some substances are allowed to cross membranes more easily then others 5. Passive Transport diffusion Spontaneous movement of a substance down its concentration gradient 6. Osmosis Passive transport of water from hypotonic to hypertonic concentration 7. cell balancing water uptake and loss Cells without wall are isotonic with their environment or have adaptations for osmoregulations. 8. Active Transport Pumping of solutes against their gradient 9. ion pumps different typed, chemical gradient and electrical gradient (voltage) 10. Exocytosis and endocytosis Know what they are and the difference between the two...
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- Spring '09