Cell Transport - Active Transport

Cell Transport

Active Transport

Cell transport that REQUIRES ENERGY

Active Transport

• Movement of materials through a membrane against a concentration gradient

• Movement of substances from areas of low concentration to areas of high concentrations

• Requires: ENERGY from the cell (ATP), and a transport protein or channel protein (these are often called pumps)

Transport of Ions

• Transport of ions: Protein pumps move ions across membranes

• Example: Sodium-Potassium Pump

Transport of Large Particles

• Move across the membrane by endocytosis or exocytosis

Endocytosis

• Cell membrane folds in around a large particle and forms a small pouch

• The pouch then "pinches off" from the cell membrane to become a vesicle inside the cell

• Phagocytosis: cell eating (engulfs food particles)

• Pinocytosis: cell drinking (engulfs fluid)

Exocytosis

• A vesicle moves to the cell membrane

• Fuses with cell membrane, and then releases its contents to the outside of the cell.

SUMMARY OF CELL TRANSPORT

QUICK QUIZ!

Multiple Choice

In PASSIVE TRANSPORT, substances move from:

• High concentration to low concentration

• Low concentration to high concentration

Multiple Choice

In ACTIVE TRANSPORT, substances move from:

• High concentration to low concentration

• Low concentration to high concentration

Multiple Choice

True or False:

In ACTIVE TRANSPORT, energy is not required.

• True

• False

Multiple Choice

True or False:

In PASSIVE TRANSPORT, energy is required.

• True

• False

Multiple Select

These are all examples of passive transport.

• Diffusion

• Endocytosis

• Facilitated diffusion

• Exocytosis

• Osmosis

Multiple Select

These are all examples of active transport.

• Protein Pumps

• Endocytosis

• Exocytosis

• Osmosis

• Facilitated diffusion