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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