32. Why do large diameter axons increase conduction velocity? a. It would decrea

Question

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 (l) by decreasing internal resistance (Ri) e. None of the above 33. Which of the following is the best explanation for the absolute refractory period of the action potential? a. Inactivated voltage-gated sodium channels b. Closed voltage-gated sodium channels c. Open slow calcium channels d. Inactivated voltage-gated potassium e. The passive properties of the axon membrane channels

Explanation / Answer

A32) I believe the correct answer to this question to be OPTION C) It would increase the length constant by increasing the internal resistance.

A33) The answer to this should be OPTION A) Inactivated voltage gated sodium channel.

because This is the time during which another stimulus given to the neuron (no matter how strong) will not lead to a second action potential. Thus, because Na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.

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