Active transport Active Transport Defined Molecules move from

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 – ATP = Adenosine Triphosphate • Acts like a pump for ions

Active Transport Video

Contractile vacuole of a Paramecium This contracting vacuole removes water from this cell

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

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

Kobe Kuiz 1) How are active and passive transport different? Similar? 2) Which molecule powers active transport? 3) How are endo- and exocytosis similar? Different? 4) Which cell part controls active transport? 5) Once inside a cell, what actually kills bacteria that have been swallowed by endocytosis? 6) During exocytosis, which organelle fuses with the cell membrane? 7) What are the types of endocytosis?