Lipid bilayer permeability — limit?
Restricts passage of polar molecules and ions.
Passive transport types — examples?
Simple diffusion, facilitated diffusion, osmosis.
Simple diffusion — mechanism?
Small molecules pass directly through lipid bilayer.
Facilitated diffusion — role?
Uses proteins to transport molecules along gradient.
Membrane proteins — in diffusion?
Carrier and channel proteins facilitate transport.
Aquaporins — function?
Allow passive water movement across membrane.
Active transport — process?
Moves substances against their gradient using energy.
ATP-driven transport — example?
Na⁺-K⁺ pump uses ATP hydrolysis.
Na⁺-K⁺ pump — function?
Maintains Na⁺ and K⁺ ionic gradients.
Secondary active transport — mechanism?
Couples movement of two molecules, one down gradient.
Endocytosis, exocytosis — process?
Vesicle-mediated transport in and out of cell.
Cytotic transport — characteristic?
Involves membrane deformation, vesicle formation.
Simple diffusion — molecules?
Lipid-soluble small molecules like O₂, CO₂.
Facilitated diffusion — proteins?
Carrier and channel proteins.
Membrane proteins — types?
Carrier proteins and ion channels.
Water movement — channels?
Aquaporins.
Active transport — energy source?
ATP hydrolysis or other forms.
Na⁺-K⁺ pump — energy?
Uses ATP to exchange ions.
Secondary active transport — example?
Na⁺-glucose cotransporter.
Endocytosis — involves?
Membrane invagination and vesicle formation.
Exocytosis — involves?
Vesicle fusion with membrane to release contents.
Cytotic transport — characteristic?
Energy-dependent, vesicle-based, membrane deformation.
Lipid bilayer — permeability?
Allows small, hydrophobic molecules, restricts ions.
Teste tes connaissances avec un QCM de 12 questions sur Cell Membrane Transport Mechanisms.
1. What is a primary effect of the active transport process carried out by the Na⁺-K⁺ pump in cells?
2. What is the primary role of simple diffusion in cellular transport?
Révisez le cours complet dans la fiche de révision de Cell Membrane Transport Mechanisms.
Voir la fiche →Importe ton cours et l'IA génère des flashcards en 30 secondes.
Générateur de flashcards