Cell Movement

Sec 3.4 & 3.5

Passive Transport

Requires no energy

Four Forms1. 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

concentrationtemperaturepressure

2. Osmosis the movement of water

Until it reaches Equilibrium

Cells 70-95% water

Red Blood cell

Isotonic

Equal water inside cell

Isotonic Hypertonic HypotonicAnimal Cell

Saline Solution.85% salt

Salt Water Distilled 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 waterTap Water

Hypertonic Isotonic Hypotonic

Carrier molecules some molecules are too big to easily diffuse across membrane and they require assistance

Transport proteins4.

Active TransportRequires a carrier molecule

and energy

Movement against the concentration gradient,

from lower to higher

Protein channe

l

Bulk Transport Phagocytosisrequires energy

Endocytosis & Exocytosis

Move out of CellMove

into Cell

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