Skeletal Muscle Physiology Worksheet

1) What percent of the body is smooth muscle? 5% to 10% Striated muscle? 40%
2) Name 3 types of muscle proteins. What is the function of each? Stroma protein constitutes about 1/5 of the muscle protein. It funtions solely as an inert structional element or skeleton, to hold the rest of the structures in place. Cellular protein also comprise about 1/5 of the muscle protein. Contractile proteins: myosin and actin, are essential for contraction.
3) What is a myofibril? consist of smaller myofilaments which form regular repeating pattern along the lenght of the fibril.
4) Sketch a picture of a sarcomere. Label the I-band, the A-band, the Z-line and the H-zone. (above)
5) Name the two filaments that make up a sarcomere. Thick filaments and This filaments
6) Draw a sarcomere at rest, stretched out and contracted. (above)
7) What is the sliding filament theory? the thick and thin filaments within the sarcomere slide past one another, shortening the entire length of the sarcomere
8) Muscle relaxation ensues upon the removal of what? calcium ions