Transport across cell membranes

Transport across cell membranes - Active Transport Requires...

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Active Transport Requires energy Movement against concentration gradient Involves membrane proteins ATP is energy used for active transport Different types of active transport: - single type of molecule in one direction - two types of molecules in same direction - two types of molecules in opposite direction (Na+/K+ pump) Secondary active transport Primary active transport: ATP used directly for moving molecule (Na+/K+ pump) Secondary active transport: - use gradients - uses ATP indirectly - ATP used to establish ion gradient - Gradient then used to move substance - Example: glucose moved into cells against gradient by pumping Na+ out  and establishing ion gradient Movement of large molecules into and out of cells - not moving through membrane – particles too large - For movement of large molecules across the cell membrane
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Transport across cell membranes - Active Transport Requires...

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