Figure 9- 2 Muscle Contractions

question 65

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.

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