Cell Movement Sec 3.4 & 3.5

Passive Transport Requires no energy Four Forms 1.Diffusion 2.Osmosis 3.Contractile vacuole 4.Facilitated Diffusion

1. Diffusion: the movement of molecules From a higher concentration to a lower concentration Movement continues until cell reaches state of equilibrium Water is a solvent

Rate of movement influenced by concentration temperature pressure

2. Osmosis the movement of water Until it reaches Equilibrium Cells 70-95% wate r

Red Blood cell Isotonic Equal water inside cell IsotonicHypertonicHypotonic Animal Cell Saline Solution.85% salt Salt WaterDistilled Water Concentration of solutes same inside & out, equal movement of water in and out of cell Concentration of solutes higher outside of cell, water moves out of cell Concentration of solutes lower outside of cell, water moves into cell

Decrease in Turgor Pressure Plant Cell in Osmosis No change in Turgor Pressure Increase in Turgor Pressure Salt Water Distilled water Tap Water HypertonicIsotonicHypotonic

Carrier molecules some molecules are too big to easily diffuse across membrane and they require assistance Transport proteins 4.

Active Transport Requires a carrier molecule and energy Movement against the concentration gradient, from lower to higher Protein channe l

Bulk Transport Phagocytosis requires energy

Endocytosis & Exocytosis Move out of Cell Move into Cell

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