What can be concluded from the following data? #1
DNA profiling of a male with Down syndrome.

#2
Karyotype of a male with a normal set of chromosomes.

#3
DNA profiling of a male with a normal set of chromosomes.

#4
Karyogram of a male with Down syndrome.

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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explanation:

what bodys are there orbiting?