Question

Roles of the Na+/ K+ pump 1. Maintain the Nat/K+ concentration gradicnt across the plasma membrane. (That's obvious) 2. It plays a role in maintaining the resting membrane potential. Why? 3. The steep electrochemical gradient of Na+ is used in "coupled active transport" (coupled pumps). If the Nat/K+ pump stops, then these Na+ coupled transport mechanisms will also eventually stop. Explain The apical surface of the epithelial cells that line the lumen of the gut contains a symport that used "coupled active transport" to absorb dietary glucose against glucose's concentration gradient. A passive glucose uniport is present on the basolateral side of these cells. In the diagram at right, explain how these transport proteins are working in order to bring about a net absorption of dictary glucose from the gut and into the ECF (blood). intestinal LOW lumen Na Na-driven glucose symport in apical tight lateral glucose protein transport of Identify the 3 different types of carrier proteins and explain whether the type of transmembrane movement they are accomplishing is active or NaKextracellular pump fluid basal Na Low passive movements 4. The Nat/K+ pump also helps maintain normal osmotic balance. Explain why, if the pump stops, the cells will start to swell. Plant cells and fresh water protozoa do NOT have a Na+/K+ pump in their plasma membrane. Use the diagram below to explain how plants and protozoa deal with osmotic stress compared to animal cells.

Answer 1