Figure 10-2 Muscle Contractions

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-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) is caused to produce isolated twitches.
E) gradually warms up.