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Understanding Active Transport and Endocytosis Processes

Explore the mechanisms of active transport, endocytosis, and exocytosis at the cellular level. Learn how molecules move against concentration gradients using ATP energy, and how cells engulf substances. Discover the roles of lysosomes and vesicles in these processes and uncover their importance in cell function.

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Understanding Active Transport and Endocytosis Processes

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  1. Active transport

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

  3. Contractile vacuole of a Paramecium

  4. 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

  5. Endocytosis & the lysosome The bacteria is engulfed by phagocytosis The bacteria is placed inside a lysosome are destroyed

  6. Amoeba and endocytosis

  7. 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

  8. Kobe Kuiz • How area 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?

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