Bio lesson 2-7

How do materials
move in and out of

cells?

Lesson 2-7

Objective: Describe how materials can move in

and out of cells.

Key Terms:

diffusion: movement of material from an area where molecules
are crowded to an area where they are less crowded.

passive transport: movement of material through a membrane
with the use of energy.

osmosis: movement of water through a membrane

active transport: movement of materials through a membrane
using energy.

Diffusion

●

molecule is the smallest unit of a

substance that has all the properties

of that substance

●

molecules are always moving

●

molecules moving from crowded

areas to less crowded areas

Open Ended

Where do most molecules move to?

Passive Transport

●

diffusion (not always) takes place through the cell

membrane

●

cell membranes have tiny holes

●

molecules move through holes until same number inside

and outside

●

does not require energy

Osmosis

●

special kind of diffusion

●

movement of water through a

membrane

●

many substances dissolve in water

before move into cell

Open Ended

What would happen if water constantly entered a cell and none left it?

Active Transport

●

cells usually need to have more molecules inside than

outside

●

molecules move toward more crowded

●

this is opposite than what naturally happens

●

requires energy

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