Chapter 12, Problem 41RQ

How does a muscle fiber incur an oxygen debt?

How do actin and myosin interact in a sarcomere to bring about muscle contraction? What roles do ATP and calcium play?

Which cell type helps to repair injured muscle fibers? ganglion cells myotube cells myoblast cells satellite cells

Which arrangement best describes a bipennate muscle? The muscle fibers feed in on an angle to a long tendon from both sides. The muscle fibers feed in on an angle to a long tendon horn all directions. The muscle fibers feed in on an angle to a long tendon horn one side. The muscle fibers on one side of a tendon feed into it at a certain angle and muscle fibers on the other side of the tendon feed into it at the opposite angle.

Which of the following statements describes smooth muscle cells? They are resistant to fatigue. They have a rapid onset of contractions. They cannot exhibit tetanus. They primarily use anaerobic metabolism.

Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above

Figure 13.22 To what structures in a skeletal muscle are the endoneurium, perineurium, and epineurium comparable? Figure 13.22 Close-Up of Nerve Trunk Zoom in on this slide of a nerve trunk to examine the endoneurium, perineurium, and epineurium in greater detail (tissue source: simian). LM × 1600. (Micrograph provided by the Regents of University of Michigan Medical School © 2012)

Which of the following terms would be used in the name of a muscle that moves the leg away from the body? flexor adductor extensor abductor

During which phase of a twitch in a muscle fiber is tension the greatest? resting phase repolarization phase contraction phase relaxation phase