Movement of Substances

Define Diffusion

The spreading out of molecules from a region of high to low concentration

Define Osmosis

The movement of water molecules through a semi-permeable membrane from a region of high to low concentration

Define Passive

Does not require energy

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Tonicity in Cells

a - hypotonic

b - isotonic

c - hypertonic

What effects does a More concentrated solution have on animal cells?

Water moves out the cell

Cell shrivels up and dies

What effects does a less concentrated solution have on animal cells?

Water moves into cell

Cell bursts and dies

What effects does an equal concentrated solution have on animal cells?

Water moves in and out the cell at equal rate

Cell volume stays the same

What effects does a More concentrated solution have on plant cells?

Water moves out of cytoplasm

Plasmolysis

What effects does a less concentrated solution have on plant cells?

Water moves into cytoplasm

Turgor Pressure

What effects does an equal concentrated solution have on plant cells?

Water moves in and out the cytoplasm at equal rate

Cytoplasm volume stays the same

Define Turgor

The force of the cell contents against the cell

wall

Define Permeable

Substances can pass through

Define Semi-Permeable

Allows some substances through but not all

Define Impermeable

Does not allow any substances to pass through

Define Active Transport

Absorption of molecules into the cells against the concentration gradient using energy.

How can osmosis help preserve food?

Salting fish or meats results in the water being removed from potential harmful micro organisms causing them to die and not spoil the food