Biology Chapter 4 Section 2

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Presentation transcript:

Biology Chapter 4 Section 2 Active Transport Biology Chapter 4 Section 2

Objectives Understand the ways various substances enter cells Compare and contrast the processes of active and passive transport

Active Transport Cell uses energy (ATP) Movement is against the concentration gradient (uphill) Movement is from low concentration areas to high concentration areas

3 types of active transport Protein Pumps Protein recognizes shape/charge of particle Protein changes shape to pull particle through membrane Example: Sodium/potassium pump (VIDEO)

3 types of active transport Endocytosis Taking large particles into the cell Cell membrane folds around a particle, forming a container (vacuole)—changing shape requires energy Receptor-mediated endocytosis Phagocytosis Pinocytosis

3 types of active transport

3 types of active transport

3 types of active transport

3 types of active transport Exocytosis Large amount of material forced out of cell Vacuole containing material fuses with cell membrane and pushes out material

3 types of active transport Exocytosis

Cell Membranes are Selectively Permeable! Video Bozeman Video Crash Course