Active Transport
How do other molecules cross the cell membrane??? Selective Transport Facilitated Diffusion (Another Passive Transport) Active Transport Protein Pumps Endocytosis Exocytosis
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Selective Transport There are two types of selective transport Facilitated Diffusion DOES NOT require the use of energy Active Transport DOES require the use of energy
Facilitated Diffusion Glucose molecules High Concentration Cell Membrane Low Concentration Protein channel
Facilitated Diffusion Does facilitated diffusion require the use of energy? NO!!!! It uses a concentration gradient to transport molecules The molecules move from an area of high concentration to an area of low concentration Most SUGAR molecules pass across the cell membrane by this method of transport
Carrier Proteins Carry Molecules Across the Membrane Good Example - transport of Glucose into the Cell
Active Transport Does active transport require the use of energy? YES!!! It uses ATP Transports against the concentration gradient. Low to High concentration Examples: Sodium Potassium Pump, Endocytosis and Exocytosis
Active Transport Molecule to be carried Molecule being carried Energy
Active Transport: Sodium Potassium Pump Move Sodium out of the cell Move Potassium into the cell Uses energy (ATP) Causes the protein to change shape Move against a concentration gradient
Sodium Potassium Pump
Bulk Transport-Active Endocytosis Pinocytosis Phagocytosis Exocytosis
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Endocytosis During ENDOCYTOSIS the Cell Membrane folds into a POUCH (Vescicle) that Encloses the Particles.
Two Types of Endocytosis: Pinocytosis and Phagocytosis PINOCYTOSIS ---"CELL DRINKING“—Small Particles PHAGOCYTOSIS---- "CELL EATING“-Large Particles
Treatments Endocytosis can be used as a method to get a cell to take in an anti-cancer treatment.
Exocytosis EXOCYTOSIS is the opposite OR reverse of ENDOCYTOSIS. EXOCYTOSIS, wastes and cell products leave the cell.
Specialized Transport Summary Transport proteins Facilitated diffusion - passage of molecules and ions with transport proteins across a membrane down the concentration gradient Active transport - movement of a substance against its concentration gradient with the help of cellular energy