During the early portion of the falling phase of an action potential (ie: right after the "peak" of the ap), na+ channels:

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Explanation:

During an action potential Na+ channels are activated to open, allowing the flow of Na+ inside the neuron. The Na+ channels close immediately after the peak of the action potential.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

answer; i believe the correct answer is (anemia);