Blood flow through an arteriole when it dilates.
a) decreases
b) remains unchanged
c) increases

The correct answer will be option C - increases.

Explanation:

The dilation or vaso-dilation is the widening or increase in the diameter of the blood vessels- arteries, arteriole and veins.  

The vasodilation is caused by the relaxation of the smooth muscle which results in the increased flow of the blood through these vessels due to a decrease in the vascular resistance.

Thus, option C - increases are the correct answer.

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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