Moving Cellular Material

1
Moving Cellular Material

• Chapter 2, Lesson 3

2
Membranes

• Control the movement of materials in and out of
  cell.
• Semipermeable only certain substances can pass
  through.
• There are many different ways for a substance to
  pass through the membrane.
• Process depends on the physical and chemical
  properties of the substance.

3
Passive Transport

• The movement of substances through a cell
  membrane
• No energy
• Usually small molecules (O2 and CO2)
• Depends on the amount of substances on each side
  of the membrane.

4
Diffusion

• The movement of substances from an area of higher
  concentration to an area of lower concentration.

5
Passive Transport - Osmosis
The diffusion of water molecules through a
selectively permeable membrane. (No energy
required)
Red Blood Cells
6
Facilitated Diffusion

• When molecules pass through a cell membrane using
  special proteins called transport proteins.

7
Active Transport
The movement of materials through a cell membrane
using energy. (Moves from low to high
concentration)
8
Endocytosis

• The process during which a cell takes in a
  substance by surrounding it with the cell
  membrane.

9
Exocytosis

• The process during which a cells vesicles
  release their contents outside the cell.