1. Active Transport
Active transport: moving molecules in a direction across the concentration gradient.
Requires energy
Molecular Transport
Endocytosis
Exocytosis

2. Molecular Transport The use of proteins to cross the membrane.
Requires energy.

3. Endocytosis
The process of taking material into the cell by means of infoldings, or pockets, of the cell membrane.
The pocket that results breaks loose from the outer portion of the cell membrane and forms a vacuole within the cytoplasm.
Phagocytosis:
Means “cell-eating”
Extensions of cytoplasm surround a particle and package it within a food vacuole
The cell then engulfs it
Requires a large amount of energy
Pinocytosis:
Means “cell-drinking”
Take up liquid from the environment by forming tiny pockets along the cell membrane, filling with liquid, and pinching off into the cytoplasm.

4. Exocytosis Used to release large amounts of material from the cell.
The membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell.