31. What effect would the voltage-gated K\' channel blocker dendrodotoxin found

Question

31. What effect would the voltage-gated K' channel blocker dendrodotoxin found in black mamba venom have on neuronal excitability? a. It would prevent action potential generation b. It would prolong the falling phase of the action potential c. It would have no effect on action potentials d. All of the above e. None of the above 32. Why do large diameter axons increase conduction velocity? a. It would decrease the length constant (B) by increasing membrane resistance (Rm) b. It would increase the length constant (a) by increasing membrane resistance (Rm) c. It would increase the length constant (B) by increasing internal resistance (Ri) d. It would increase the length constant (B) by decreasing internal resistance (Ri) e. None of the above

Explanation / Answer

31.b it would prolong the falling phase of action potential blocking potassium channels slows repolarization

32.d it incresaes thr length constant by decreasing internal resistance

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