After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasm. This results in a condition known as

These factors, occurring after death; muscle fibers running out of ATP, and calcium beginning to “leak” from the sarcoplasm - This results in a condition known as Rigor Mortis; a stiffening of the body; besides being a natural effect of these Biochemical actions, are often used, with many other sorts of data, used for Post Mortem analysis, and law enforcement in those cases that are suspicious.

Explanation:

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.  

read more on -