1. Day 5

2. Active (energy needed) Transport
Transportation against a concentration gradient.
Active transport requires energy to move substances against their concentration gradients.
Most often this energy is supplied directly or indirectly by ATP.
Two types:
Solute pumping
Vesicular transport

3. BODY MIND ACTIVITY
Active transport – solute pumping

4. Vesicular transport
Many proteins and polysaccharides are too large to enter the cell using carrier proteins, so they use vesicles.
Vesicles are membrane bound sacs.
The vesicle membrane is a lipid bilayer, so vesicles can bud off from the membrane, fuse with it or fuse with other vesicles.

5. Vesicles
Endocytosis: movement of a large substance into the cell by means of a vesicle.
During endocytosis the membrane forms a pouch around the substance, pinches off and forms a vesicle inside the cell.

7. Vesicles
Exocytosis: movement of material out of a cell by means of a vesicle.
During exocytosis a vesicles inside the cell fuse with the cell membrane. The contents of the vesicle are then release outside of the cell through the cell membrane.
Exocytosis is used to transport proteins modified by the Golgi apparatus.

9. Video
McGraw Hill video of
endo and exo cytosis
Cellular Transport