Skeletal Muscle Physiology Worksheet

Skeletal Muscle Physiology Worksheet

1. What percent of the body is smooth muscle? Striated muscle? 40% striated, 5% to 10% smooth

2. Name 3 types of muscle proteins. What is the function of each? Stroma protein- constitutes about 1/5 of the muscle protein. It functions solely as an inert structural element, or skeleton to hold structures in place.Cellular proteins- also comprise about 1/5 of the muscle protein it is not a muscle.Contractile proteins- Two types of protein myosin and actin, the constitute 35% and 15% of the total muscle.

3. What is a myofibril? Longitudinal striations in the muscle form transverse striations in the muscle.

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. Thin, thick

6. Draw a sarcomere at rest, stretched out and contracted.

7. What is the sliding filament theory? Cross-bridges


8. Muscle relaxation ensues upon the removal of what? Calcium ions.