Active transport.

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Presentation transcript:

Active transport

Active Transport Defined: Molecules move from a LOW to a HIGH concentration Against (up) the concentration gradient ATP energy opens/closes protein channel/pump ATP = Adenosine Triphosphate Acts like a pump for ions

Contractile vacuole of a Paramecium

Endocytosis Endocytosis: Process in which the plasma membrane takes in substances (2 types) 1) Phagocytosis: when a cell engulfs a solid particle WBCs are called phagocytes 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

Amoeba and endocytosis

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

Recap How are active and passive transport different? Which molecule powers active transport? How are endo- and exocytosis similar? Different? Which cell part controls active transport? Once inside a cell, what actually kills bacteria that have been swallowed by endocytosis? During exocytosis, which organelle fuses with the cell membrane?