1. BOTH require energy from the cell
Bulk Transport
When molecules are too large to move through a channel protein or by using a carrier protein, vesicles are used to move the “bulk” molecule.
Bulk transport of substances is accomplished by
1. endocytosis – movement of substances into the cell
2. exocytosis – movement of materials out of the cell
BOTH require energy from the cell
B3, B2.1, B3.6

2. Endocytosis occurs when the plasma membrane envelops food particles and liquids into a vesicle to take into the cell
-3 types:
B3, B2.1, B3.6

3. 1. Phagocytosis (cell-eating)– the cell takes in particulate matter
B3, B2.1, B3.6

4. 2. Pinocytosis (cell-drinking) – the cell takes in only fluid
B3, B2.1, B3.6

5. -the receptors are recycled for later use
Receptor-mediated endocytosis – specific molecules are taken in after they bind to a receptor
-the receptors are recycled for
later use
B3, B2.1, B3.6

6. Exocytosis occurs when material is discharged from the cell.
-vesicles in the cytoplasm fuse with the cell membrane and release their contents to the exterior of the cell
-used in animals to secrete hormones, neurotransmitters, digestive enzymes, etc
B3, B2.1, B3.6