In this theory of muscle growth, muscle fibers are able to split and create new fibers.
a. hypertrophy
b. hyperplasia
c. atrophy
d. none of the above

The right option is b. hyperplasia

Hyperplasia is the increase in the reproduction rate of cells within a given tissue which may lead to the enlargement of the tissue or organ. Hyperplasia is the first stage in the development of cancer. The rapid increase in number of the cells occurs in response to a certain stimulus and it is being regulated by the cell. If the cells rapidly divide in the absence of physiological stimulus, it is an unregulated cellular proliferation and this increases the risk of cancer.

b. hyperplasia

Explanation:

Muscle hyperplasia is defined as an increase in the number of muscle fiber cells compared to the original number, not the individual volume of each cell.

This phenomenon of adaptation is usually more observed in muscle tissue submitted to strength training, since it leads to greater muscle growth compared to other physical exercises.

Unlike hyperplasia, hypertrophy does not develop new muscle cells but increases the size of existing cells.

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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uh two lol