The apparatus in the diagram was designed with the understanding that animals take in oxygen and release carbon dioxide, and that ordinary air contains very little carbon dioxide. the apparatus can be used to measure the

b.

hoped i

explanation:

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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