The bone building cells, once active, produce osteoid which is predominantly made up of the protein

The cell that is being described in the sentence above is the osteoblast as this is the bone building cell that is responsible of making up the bone that maintains its balance and form in the bones as it is present and important.

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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i think the answer is g1

hope i

-lavira: )