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Cell Transport
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(High to Low)

Diffusion continues until all molecules are evenly spaced (equilibrium is reached)-Note: molecules will still move around but stay spread out.

http://bio.winona.edu/berg/Free.htm

Simple Diffusion Animation

Slide 11

2. Facilitated diffusion: diffusion of specific particles through transport proteins found in the membrane

2. Facilitated diffusion: diffusion of specific particles through transport proteins found in the membrane

Transport Proteins are specific – they “select” only certain molecules to cross the membrane

Transports larger or charged molecules

Facilitated diffusion (Channel Protein)

Diffusion (Lipid Bilayer)

Passive Transport: 2. Facilitated Diffusion

Carrier Protein

A

B

http://bio.winona.edu/berg/Free.htm

Slide 12

High Concentration

High Concentration

Low Concentration

Cell Membrane

Glucose

molecules

Protein

channel

Passive Transport: 2. Facilitated Diffusion

Go to Section:

Transport Protein

Through a 

Cellular Transport From a-

High

Low

Channel Proteins animations

Slide 13

3.Osmosis: diffusion of water through a selectively permeable membrane

3.Osmosis: diffusion of water through a selectively permeable membrane

Water moves from high to low concentrations

Water moves freely through pores.

Solute (green) to large to move across.

Osmosis animation

Passive Transport: 3. Osmosis

Slide 14

Active Transport

Active Transport

cell uses energy

actively moves molecules to where they are needed

Movement from an area of low concentration to an area of high concentration

(Low  High)

Three Types:

Slide 15

Types of Active Transport

Types of Active Transport

1. Protein Pumps -transport proteins that require energy to do work

Example: Sodium / Potassium Pumps are important in nerve responses.

Sodium Potassium Pumps (Active Transport using proteins)

Protein changes shape to move molecules: this requires energy!

Slide 16

Types of Active Transport

Types of Active Transport

2. Endocytosis: taking bulky material into a cell

Uses energy

Cell membrane in-folds around food particle

“cell eating”

forms food vacuole & digests food

This is how white blood cells eat bacteria!

Slide 17

Types of Active Transport

Types of Active Transport

3. Exocytosis: Forces material out of cell in bulk

membrane surrounding the material fuses with cell membrane

Cell changes shape – requires energy

EX: Hormones or wastes released from cell

Endocytosis & Exocytosis animations

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