Exam 17: Muscle Contraction

Explain the similarities and differences between skeletal and cardiac muscle cells. How do these differences reflect the functioning of the heart?

Because of the elasticity of the muscle fiber, as soon as the contraction stops, the sarcomere goes back to its precontraction length.

All of the following are true characteristics of an isometric contraction except:

Muscle cells have one nucleus and one mitochondrion.

Most body movements are _____ contractions.

Excitability and irritability are interchangeable terms in regard to muscle cells.

Because the process of catabolism is less than 100% efficient, some of the energy is given off as heat.

From smallest to largest, which of the following is the correct order of arrangement?

Cross-bridges are also called:

At rest, troponin covers the active sites on the actin molecules.

The result of endurance training is more blood vessels, not more muscle cells.

Myosin filaments interact with actin filaments during muscle contraction.

The following are characteristics that allow muscles to function as they do: excitability, contractility, extensibility, and regulation.

List and describe the three general functions of skeletal muscle tissue.

One I-band resides within two sarcomeres.

Match each term with its corresponding definition or description. -Beadlike globular protein that makes up the thin myofilament

Describe and/or diagram the sarcomere.

Match each term with its corresponding definition or description. -The ability of a muscle cell to be stimulated or excited

Which of the following is not a factor in why a warm muscle contracts more forcefully than a cool muscle?

Sarcolemma is a: