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Active Transport
• Defined: Molecules move from a LOW to a HIGH
concentration
• ATP energy needed to fight diffusion
– ATP = Adenosine Triphosphate
• ATP activates pumps (see animation)
Endocytosis
• Endocytosis: Process in which the plasma membrane
takes in substances (2 types)
– 1) Phagocytosis: when a cell engulfs a solid particle
– 2) Pinocytosis: when a cell engulfs a liquid particle
• Unfortunately, viruses can also enter our cells this way
Endocytosis & the lysosome
The bacteria is engulfed by
phagocytosis
The bacteria is placed
inside a lysosome are
destroyed
Exocytosis
• Defined: Process when substances are expelled from
the cell
• Proteins, nutrients, and waste exit by exocytosis
• Vesicle carry & release objects through the plasma
membrane
Contractile vacuole of a Paramecium
As water enters this cell by diffusion, it is
immediately pumped out to prevent bursting
Kobe Kuiz
1) How area active and passive transport
different?
2) Which molecule powers active transport?
3) How are endo- and exocytosis similar?
Different?
4) Which cell part controls active transport?