1. ATP
ATP
Active Transport
Using
Energy
ATP
ATP

2. Active Transport
Transport methods that involve work (energy) by the cell are forms of active transport.

4. Carrier molecules are proteins in the cell membrane that transport large molecules or molecules that cannot dissolve in the lipids that make up the cell membrane.
They pick up molecules on one side of the membrane and move them to the other side.

6. 2 Kinds of Carrier Transport
1.facilitated diffusion - substances move with the concentration gradient
Carrier proteins speed things up
passive transport because energy is not used
ex: glucose

8. 2. active transport - involves the movement of materials against the concentration gradient
requires the use of cellular energy
ex: Liver cells store glucose and have higher concentration than the blood. The cells use active transport to move glucose from the blood into the liver.
Ex: Na+ – K+ pump

11. Bulk Transport
Movement in Vesicles

12. Endocytosis
endo =
to enter
cyte = cell

13. Large molecules, such as protein, enter the cell when they are surrounded by the cell.
This forms a vesicle for the transport of these molecules.
This process is called endocytosis.

15. Phagocytosis “ cell eating ”
Solid particles enter through a vesicle
ex: white blood cells eating bacteria

17. Phagocytosis =
cells eating

20. Pinocytosis “ cell drinking ”
Particles enter as a droplet (liquid)
Ex: human egg cell absorbs nutrients
Ex: absorption of nutrients by cells in the intestines

22. Pinocytosis =
cells drinking

23. Exocytosis
exo = to exit
cyte = cell

24. When large particles leave the cell, they use a vesicle that fuses with the cell membrane.
The releasing of these molecules is called exocytosis.

26. ex: secretion of proteins by a cell

33. The End