Which of the following molecules are attached to the Z-disk in skeletal muscle?

Question

Which of the following molecules are attached to the Z-disk in skeletal muscle? Actin thin filaments Myosin thick filaments Tropomyosin Troponin None of the above Which of the following muscles are not striated? Fast-twitch fibers in the forearm Slow-twitch fibers located between the ribs (intercostals muscles) Conducting fibers in the left ventricle Heart muscles in the left atrium All of the above are striated muscles Ryanodine receptors in striated muscle are located in: Sarcolemma T-tubules Sarcoplasmic reticulum Mitochondria All of the above Which of the following is the main Ca^2+ -binding protein responsible for initiation of the cross- bridge cycle in skeletal muscle? Actin Myosin Tropmyosin Troponin None of the above

Explanation / Answer

14. Acton thin filaments

Sarcomeres at ends

15. E

All the above are straited

16. Sarcoplasmic reticulum

These are responsible for the release of ca2+ from intra cellular stores

17.

Myosin

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