What do aerobic and anaerobic exercises have in common?

Aerobic exercise refers to an activity that initiates the heart rate and breathing to enhance but not much to an extent that one cannot sustain the activity for more than certain minutes. It simply means exercise with oxygen.

On the other hand, anaerobic means in the absence of oxygen. It is the kind of exercise where one gets out of breath in just a few minutes, like when one lifts weights for bettering strength, when one climb a long flight of stairs, or when one sprints.

The common thing between both these forms of exercises is that they both promote physical endurance.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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