Although testosterone and related steroids clearly increase muscle mass during puberty, it has been more difficult to determine scientifically whether adult men with normal testosterone can get stronger from extra steroids, partly because:

It is unethical.

Explanation:

Testosterone is the important hormone that plays an important role in the development of male development and steroids are also involved in the proper development of an individual.

These  testosterone and related steroids increase muscle mass during puberty. This is difficult to determine testosterone can get stronger from extra steroids because this is against the ethics research. This can be used by the athletes to improve their performance.

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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