Figure 9- 1 Skeletal Muscle Fiber

question 67

Multiple Choice

Figure 9- 1 Skeletal Muscle Fiber
Use Figure 9- 1 to answer the following questions:
-Cross- bridges are portions of

• A) troponin molecules.
• B) myosin molecules.
• C) tropomyosin molecules.
• D) calcium ions.
• E) actin molecules.