Cell Transport

It controls what enters and leaves the cell.

It produces energy for the cell.

It stores genetic information.

It breaks down waste products.

To maintain homeostasis

To produce energy

To divide rapidly

To communicate with other cells

All materials are allowed through the cell membrane

No materials are allowed through the cell membrane

Some materials are allowed through the cell membrane while others are blocked.

The cell membrane does not deal with cell transport.

Diffusion

Active transport

Endocytosis

Exocytosis

Small, hydrophobic, and uncharged molecules

Large, charged molecules

Proteins and polysaccharides

Ions and nucleic acids

Osmosis is the diffusion of water across a semipermeable membrane.

Osmosis requires energy input from the cell.

Osmosis moves molecules against the concentration gradient.

Osmosis only occurs in plant cells.

From an area of high concentration to low concentration.

Molecules stay put.

From an area of low concentration to high concentration.

Only large, charged molecules can pass through to the inside of the membrane.

Protein pumps

Exocytosis

Osmosis

Endocytosis