Question

Which of the following is true about skeletal muscle?

• A. In the muscle fibre, actin is the thick filament.
• B. The sarcoplasmic reticulum regulates the level of Ca${}^{2+}$ within a muscle cell.
• C. Unlike a nerve cell, a muscle cell does not possess an excitable membrane.
• D. In a muscle fibre, myosin is the thin filament.
• E. Contraction of a muscle fibre can occur in the absence of Ca${}^{2+}$.

Answer 1

Answer: (B)

The sarcoplasmic reticulum regulates the level of Ca${}^{2+}$ within a muscle cell.