Question

In a neuron, during the depolarization phase that may trigger an action potential _____. See Concept 48.3 (Page) View Available Hint(s) In a neuron, during the depolarization phase that may trigger an action potential _____. See Concept 48.3 (Page) most voltage-gated sodium channels become inactivated most voltage-gated sodium channels are open some voltage-gated sodium channels are open most voltage-gated sodium and potassium channels are open most voltage-gated potassium channels are open

Answer 1

Answer:

some voltage-gated sodium channels are open

Explanation:

In a neuron, a stimulus from a pre-synaptic neuron/sensory cell triggers the depolarization of the target cell toward the threshold of excitation ( i.e., the value where there is an initiation of an action potential). When this threshold is reached, sodium channels are opened and the membrane depolarizes, triggering an action potential. As soon as depolarization is complete, potassium channels are opened, sodium channels close and the neuron is hyperpolarized (.i.e., return to the resting potential).