In Twitch Summation

Multiple Choice

In twitch summation:

A) The muscle fiber is stimulated again before the action potential has returned to resting potential.
B) The muscle fiber is stimulated again before the filaments have completely returned to their resting position.
C) Stronger muscle contractions occur but stronger action potentials do not occur.
D) The muscle fiber is stimulated again before the action potential has returned to resting potential, and stronger muscle contractions occur but stronger action potentials do not occur.
E) The muscle fiber is stimulated again before the filaments have completely returned to their resting position, and stronger muscle contractions occur but stronger action potentials do not occur.