Skeletal Muscle Physiology Worksheet

What percent of the body is smooth muscle? 40% Striated muscle? 5 to 10%

Name 3 types of muscle proteins. What is the function of each?

1. Stroma - a structural element to hold structures in place

2. Cellular - are not characteristic of muscle

3. Contractile - two types: myosin and actin.

What is a myofibril? A muscle fiber.

Sketch a picture of a sarcomere. Label the I-band, the A-band, the Z-line and the H-zone.

Name the two filaments that make up a sarcomere. Thick filament and thin filament.

Draw a sarcomere at rest, stretched out and contracted.

At Rest:

Stretched Out:

Contracted:

What is the sliding filament theory? That filaments slide together or apart rather than shortening or lengthening.

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