Skeletal Muscle Physiology Worksheet

1. What percent of the body is smooth muscle? Striated muscle? 5-10% is smooth muscle and 40% is striated muscle.
2. Name 3 types of muscle proteins. What is the function of each? Stroma-functions solely as an inert structural element. Cellular- Contractile-essential for contraction
3. What is a myofibril? An independent cylindrical element that runs the length of the muscle fiber.
4. Sketch a picture of a sarcomere. Label the I-band, the A-band, the Z-line and the H-zone.
5. Name the two filaments that make up a sarcomere. The thick filament and the thin filament.
6. Draw a sarcomere at rest, stretched out and contracted.
7. What is the sliding filament theory? It states that muscle contraction results from the relative movement of the thick and thin filaments past each other.
8. Muscle relaxation ensues upon the removal of what? Calcium ions.