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- Cell Biology
- Passive transport
- Simple diffusion
- Facilitated diffusion
- Active transport
- The sodium
- •Cell Biology Lecture 4: Membrane Transport Cells must exchange substances with their environment to survive.
- •Passive transport moves ions across membranes without requiring metabolic energy (ATP).
- •Simple diffusion moves nonpolar molecules like O2 and CO2 down their concentration gradient.
- •Facilitated diffusion requires transmembrane channel proteins or carrier proteins to transport polar ions like glucose and sodium.
- •Active transport moves solutes against their electrochemical gradient, strictly requiring energy from ATP hydrolysis.
- •potassium pump (Na+/K+-ATPase) maintains crucial osmotic equilibrium and resting membrane potential by pumping 3 Na+ ions out of the cell and 2 K+ ions into the cell.
Key Takeaway: Cell Biology Lecture 4: Membrane Transport Cells must exchange substances with their environment to survive. The sodium-potassium pump (Na+/K+-ATPase) maintains crucial osmotic equilibrium and resting membrane potential by pumping 3 Na+ ions out of the cell and 2 K+ ions into the cell.
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