Exam 17: Muscle Contraction

Name and describe the myofilament fibers in the sarcomere.

When the muscle looks "at rest," the ATP has already transferred its energy to the actin fiber.

Hemoglobin carries oxygen in red blood cells, and myoglobin stores oxygen in muscle fibers.

Describe the structure of smooth muscle. Differentiate between single-unit and multiunit muscle tissue.

A satellite cell can fuse with myocytes during strength training to make larger muscle fibers.

The first event to occur in muscle relaxation is that:

Which of the following statements about cardiac muscle is incorrect?

In the structure called a triad, the T-tubule is sandwiched between:

Match each term with its corresponding definition or description. -Inward extensions of the sarcolemma that allow impulses to go deeper into the cell

The shorter a muscle before contraction, the more tension it will be able to generate.

The release of calcium by the sarcoplasmic reticulum begins the contraction phase of a twitch contraction.

Tonic contractions give the muscle its muscle tone.

Cardiac muscles require a stimulus from a motor neuron to contract, just as striated muscles do.

Muscles usually contract to about _____ of their length.

The characteristic of the muscle cell that directly causes movement is:

Myosin filaments attach to the Z disk.

Myocyte is another term for a muscle cell.

The myofibrils contain about how many sarcomeres?

The lactic acid produced by anaerobic respiration is converted back to glucose in the:

All of the following are characteristics of smooth muscle except: