What triggers an action potential? a. A receptor potential b. A post-synaptic po

Question

What triggers an action potential? a. A receptor potential b. A post-synaptic potential c. A pacemaker potential d. Any of the above e. None of the above The rising/depolarizing phase of the action potential in neurons is associated with a. Increased Na permeability b. Increased K permeability c. Increased Na permeability and decreased K permeability d. Increased K permeability and decreased Na permeability e. Increased Ca permeability The falling/repolarizing phase of the action potential is associated with a. Increased Na permeability b. Increased K permeability c. Increased Na permeability and decreased K permeability d. Increased K permeability and decreased Na permeability e. Increased Ca permeability The positive feedback loop that insures an action potential fires is a generated by a. Voltage-gated K channels b. Voltage-gated Na channels c. Voltage-gated Ca channels d. Voltage-gated Cl channels The negative feedback loop that helps to end absolute refractoriness of a neuron is generated by a. Voltage-gated K channels b. Voltage-gated Na channels c. Voltage-gated Ca channels d. Voltage-gated Cl channels During relative refractoriness, a. All voltage-gated Na channels have reset b. All voltage-gated K channels have closed c. No voltage-gated Na channels have reset d. Some voltage-gated Na channels have reset e. All voltage-gated K channels are inactivated

Explanation / Answer

35. B. A post synpatic potential. action potential triggers when enough depolarization accumulates to bring the action potential up to threshold.

36.C. increased Na permeability and decrease K permeability.

37. D. Increased K permeability and decrease Na permeability.

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