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Unformatted text preview: Last of Cellular function: 9/12 Review Na+/K+-ATPase What mechanisms help cell undergo bulk transport? How do membrane proteins facilitate bulk transport? How do exocytosis and endocytosis differ? Review of membrane proteins and their functions. Why is the Na+/K+-ATPase one of the most important transmembrane proteins on a plasma membrane? This ubiquitous enzyme is a transmembrane, primary active, and an antiport. Check out this Great Review Animation: http://www.tvdsb.on.ca/westmin/science/sbioac/homeo/action.htm Review of Na+/K+-ATPase Functions: 1) Regulation of intracellular Na+ and K+ content/water volume. Na+ sphere of hydration > K+ sphere of hydration 2) Pump itself is Primary Active, other secondary active pumps depend a pre-existing Na+ concentration gradient. Consider glucose transport. 3) Maintaining membrane potential (voltage). All cells have a membrane potential, neurons modify potential to exchange information status. 4) Heat Production: Some cells create “futile cycles” where they just oxidize ATP to run the Na/K-ATPase and let the ions leak back in/out....
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This note was uploaded on 04/17/2008 for the course BIOL 211 taught by Professor Wilson during the Fall '07 term at Winona.
- Fall '07