Skeletal Muscle Quiz

1. A fascicle is a bundle of muscle fibers. Which connective tissue layer directly surrounds each fascicle?

2. A person lifts the front of the foot toward the shin while keeping the heel down. Which muscle is chiefly responsible?

3. Standing on tiptoe requires plantar flexion at the ankle. Which muscle is a major contributor to this action?

4. An injury damages the dense connective tissue that attaches a skeletal muscle to a bone. Which structure has most likely been injured?

5. Which connective tissue layer wraps an individual skeletal muscle fiber?

6. A person straightens the knee while rising from a chair. Which muscle group is primarily producing this movement?

7. Which connective tissue layer surrounds an entire skeletal muscle?

8. A postural muscle must sustain activity for long periods and resist fatigue. Which skeletal muscle fiber type is best suited to this role?

9. What is the repeating contractile unit within a myofibril?

10. Why does skeletal muscle appear striated under a microscope?

11. As a sarcomere shortens during contraction, which region remains the same length?

12. During skeletal muscle contraction, calcium ions bind directly to which regulatory protein?

13. One motor neuron and all the skeletal muscle fibers it controls together form what structure?

14. Which protein forms the main component of the thin filaments in a sarcomere?

15. In standard anatomical terminology, what is the attachment called that usually moves more during a muscle contraction?

16. After the first part of shoulder abduction has begun, which muscle becomes the main mover for raising the arm out to the side?