Which of the following you states the law of conservation of mass? A In a chemical reaction, two compounds combine to form a new compound.
B
In a chemical reaction, atoms are rearranged, and some join new molecules.
С
Mass cannot be created or destroyed in a chemical reaction,
D
Energy is neither created nor destroyed in a chemical reaction,

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the answer to your question is b

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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