Figure 10-2 Muscle Contractions

Multiple Choice

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-What is thought to happen in a muscle during the response shown in graph (a) ?

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