Figure 9- 2 Muscle Contractions

Multiple Choice

Figure 9- 2 Muscle Contractions
Use Figure 9- 2 to answer the following questions:
-What is thought to happen in a muscle during the response shown in graph a) ?

A) It is aged and has lost contractile proteins.
B) There is a gradual increase in the concentration of calcium ions in the sarcoplasm.
C) It is producing more ATP as tension increases.
D) It is fatigued and must make repeated efforts to twitch normally.
E) It is getting stronger with exercise.