Exam 17: Muscle Contraction

The study of muscle activity is called myography.

In smooth muscle cells, the calcium needed for contraction comes from outside the cell rather than from inside the cell as it does in striated muscle contraction.

Describe the physiological process of muscle contraction.

The sarcoplasmic reticulum continually pumps calcium ions out of the sarcoplasm and stores them in sacs.

Physiological muscle fatigue may be caused by:

The term striated involuntary muscle refers to cardiac muscle.

Cross-bridges are also called:

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

The plasma membrane of a muscle fiber is called the:

When the sarcomere contracts, the A-bands become smaller.

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

When smooth muscles have rhythmic contractions called peristalsis, they are able to move food through the digestive tract.

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

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

Each motor neuron in the motor unit is able to stimulate as many as two dozen muscle fibers.

Attempting to pick up an object too heavy to lift would result in which type of muscle contraction?

Which of the following is not a part of the neuromuscular junction?

Match each term with its corresponding description regarding the sliding-filament theory. -The stimulus to contract the muscle is carried inside the muscle by this structure

Explain isometric muscle contractions and the two types of isotonic contractions.

A motor unit is most correctly described as _____ and a motor neuron.