Membrane Transport

Membrane Transport : Key with answers

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Membrane Transport by Mind Map: Membrane Transport

1. Diffusion

1.1. • No energy • Along concentration gradient

1.1.1. Simple

1.1.1.1. directly through membrane or channel protein

1.1.1.1.1. affecting factors

1.1.2. Facilitated

1.1.2.1. needs carrier protein

1.1.2.1.1. affecting factors

2. Active Transport

2.1. • Needs energy • Against concentration gradient

2.1.1. Primary Active

2.1.1.1. Diretly uses ATP

2.1.1.1.1. Carrier protein uses ATP to move molecules across cell membrane

2.1.2. Secondary Active

2.1.2.1. Energy for transport comes from stored energy of ionic concentration gradient between intracellular and extracellular environments

2.1.2.1.1. Co-transport

2.1.2.1.2. Counter Transport

3. Specialized Transport Mechanisms

3.1. Endocytosis

3.1.1. Material moving into the cell and uses energy

3.1.1.1. Pinocytosis: to drink; smaller molecules

3.1.1.1.1. • Uptake of soluble molecules • Non-specific engulfment of molecules

3.1.1.2. Phagocytosis: to eat; larger molecules

3.1.1.2.1. • Uptake of particulate material • Only recognized particles are engulfed

3.1.1.3. Receptor Mediated

3.1.1.3.1. • Uptake of specific molecules using specific membrane receptor proteins

3.2. Exocytosis

3.2.1. Material moving out of the cell and uses energy

3.2.1.1. • Process of secreting protein made by cell • Vesicles from Golgi apparatus move toward cell membrane and fuse with it • As fused membranes “flatted out”, vesicle contents are released into the interstitial space • Vesicle membrane is added to the cell membrane to assist in renewal of phospholipid bilayer