Please answer the following questions for numbers 30,31 and 32 please. If you ar
ID: 199651 • Letter: P
Question
Please answer the following questions for numbers 30,31 and 32 please. If you are not sure please write it next to the problem number. I am a little confused on these, I will rate good!
Stimulating current pulses -65 Time (ms) 30. How many of the numbered current pulses in the figure above caused the membrane potential to reach the threshold? a. 1 b. 2 c. 3 d. 5 e. 8 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 (B) 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 aboveExplanation / Answer
Q 30 Answer- C Hint-It is Shown in the Figure only 6,7 & 8 current pulses caused the membrane potential to reach the threshold.
Q31 Answer- B Hint-Dendrotoxin bind to nodes of Ranvier of motor neuron and blocks the activity of potassium channels.By doing this, they prolong the duration of the action potential and increase the release of Ach at the neuromuscular junction.
Q32 Answer-B Hint-Large Axon diameter means larger membrane area which in turn means more ion channels.Rm is a function of open ion channels.so, Rm increases with increase in ion channels and since Rm and length constant are proportional to each other, Length constant increases.