Multiple Choice
In the context of passive transport across cell membranes, what is diffusion?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In animal cells, what is the primary mechanism by which water enters the cell across the plasma membrane under normal physiological conditions?
A
Active transport via the Na+/K+ ATPase pumping water molecules into the cytosol
B
Receptor-mediated endocytosis of extracellular fluid into vesicles
C
Facilitated diffusion of water through glucose transporters (GLUT proteins)
D
Osmosis, mainly through aquaporin water channels down a water potential (osmotic) gradient
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