3.5 Active Transport, Endocytosis, and Exocytosis

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Presentation transcript:

3.5 Active Transport, Endocytosis, and Exocytosis KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.

Maintains homeostasis! Active Transport Defined: Molecules move from a LOW to a HIGH concentration ATP energy opens/closes protein channel ATP = Adenosine Triphosphate Occurs through protein pumps Maintains homeostasis!

3.5 Active Transport, Endocytosis, and Exocytosis A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Cells use energy to transport material in vesicles. Endocytosis is the process of taking material into the cell.

Endocytosis 2 types of endocytosis: 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

Amoeba and endocytosis

3.5 Active Transport, Endocytosis, and Exocytosis Exocytosis is the process of expelling material from the cell.

Exocytosis Proteins, nutrients, and waste exit by exocytosis Vesicle carry & release objects through the plasma membrane

Contractile vacuole of a Paramecium Water being pumped out of this cell to prevent bursting

Quick Review Diffusion is the movement of particles from high to low concentrations Some methods of movement don’t require energy (Passive Transport) Some methods of movement require energy (Active transport) Farts smell because of diffusion