Read the passage about an athlete.

when an athlete's body temperature begins to climb, blood vessels in the skin dilate. as a result, the athlete's face turns red because warm, oxygenated blood moves to the surface of the skin. this process to reduce overall body temperature and prevent overheating.
which organ system most likely to keep an athlete from overheating?

a
the digestive system

b
the circulatory system

c
the respiratory system

d
the reproductive system

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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