Thick and thin myofilaments have different compositions. For each descriptive phrase, indicate whether the filament is,a. thick orb. thin._____(1) contains actin_____ (2) contains ATPases_____(3) attaches to the Z disc_____(4) contains myosin_____(5) contains troponin_____(6) does not lie in the I band

The primary action of the biceps brachii muscle of the anterior arm is to flex the forearm at the elbow. However, when this muscle is inflamed, pain is felt in the shoulder. Explain this finding.

Which of the following types of muscle fibers have low myosin ATPase activity and are classified as slow-twitch?

a. Type I fibers

b. Type IIa fibers

c. Type IIx fibers

d. Type III fibers