Figure 10-2 Muscle Contractions

Use Figure 10-2 to answer the following questions:
-To produce a contraction similar to the one in graph (b), the muscle

A) must be stimulated to the point of fatigue.
B) must be stimulated again before it has relaxed from the previous stimulation.
C) is excited by a stimulus of increasing intensity.
D) must go through a rapid series of isolated twitches.
E) generates more and more thin and thick filaments.