Exam 6: The Muscular System

Which one of the following statements is TRUE regarding the structure of a muscle?

At the end of the contractile period, energy from the breakdown of ATP is used to

Which one of the following activities would fast-twitch fibers be most useful for?

Using the figure above and labels A through D below, identify the structures indicated. -Structure C is a(n) ________.

Once a muscle cell has depleted its small supply of ready-made ATP, what will it use next for energy?

Using the figure above, identify the parts of the sarcomere. -Label B represents a(n) ________.

In order for fast-twitch muscle fibers to produce ATP, a phosphate from the high-energy molecule creatine phosphate is transferred to ________.

Which one of the following statements correctly describes activities of muscles?

Following electrical stimulation of a muscle cell, calcium functions to

Cells in cardiac muscle that determine the rate of contraction are ________ cells.

During a workout session, you may begin to experience a burning sensation in a muscle group that you are targeting with your choice of exercises. This is most likely due to anaerobic metabolism in that muscle, generating ________.

Match the following muscles to their function. -lifts and braces shoulders; draws head back

The primary energy source used by muscle cells to generate ATP is

The contractile proteins that are located in myofibrils are called ________ and ________.

Match the following muscles to their function. -bends lower leg at knee and foot away from ankle

Match the following muscles to their function. -raises arm

A muscle is arranged in bundles of muscle fibers, called ________.

Match each disorder or disease of the muscular system with its description. -disease caused by a bacterial infection; bacterial toxin affects primarily the muscles of the jaw and neck; also known as "lockjaw"

Which one of the following is the most efficient long-term source of ATP for muscle cells?

Muscles constitute 60-70% of our body mass.