LESSON 3: MOVING CELLULAR MATERIAL

LESSON 3: MOVING CELLULAR MATERIAL

PASSIVE TRANSPORT

- The movement of a substance through a cell membrane without using the cells energy

- Depends on the amount of substance on each side of the membrane - If there are more oxygen molecules outside of a cell than there are inside of a cell, then oxygen will move into the cell by passive transport

DIFFUSION

- The movement of a substance from an area of higher concentration to an area of lower concentration

- Diffusion continues until the concentration on each side of the cell membrane is equal

OSMOSIS

- Diffusion of water molecules through a membrane - Travels from an area of high concentration to an area of

low concentration - Facilitated diffusion: movement of molecules through a

cell membrane using special proteins called transport proteins - Happens when molecules are too large to move through the membrane

OSMOSIS

Carrier Protein

Channel Protein

- Transport proteins

- Carry large molecules through the membrane

- Transport proteins

- Form pores through the cell membranes through which ions can pass.

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