Exam 17: Muscle Contraction

Convulsions are abnormal, uncoordinated tetanic contractions of varying groups of muscles.

Fibrillation is a tetanic contraction of cardiac muscle.

Muscle cells are called fibers, because they are long and thin. They can be 40 mm long but only about 10 mm in diameter.

Recruitment is the term used to describe the addition of more motor units to allow a muscle to increase its strength of contraction.

Painful muscle contractions or involuntary twitches are called:

Which of the following is not an end-product of the breakdown of ATP?

Match each term with its corresponding definition or description. -Protein that looks like "bundled golf clubs"; makes up the thick myofilament

The motor end plate is part of the neuromuscular junction.

The degree of a muscle's strength is influenced by many factors, including its metabolic condition and number of motor units recruited.

A compound that mimics the action of acetylcholine at the neuromuscular junction would cause muscles to become flaccid.

Muscle fibers of skeletal muscle contain several nuclei.

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

Physiological muscle fatigue may be caused by:

Describe the physiological process of muscle contraction.

After it is released from the sarcoplasmic reticulum, the calcium combines with which protein?

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

Match each term with its corresponding description regarding the sliding-filament theory. -Ion that is released by the sarcoplasmic reticulum

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

Match each term with its corresponding description regarding the sliding-filament theory. -Protein that has active sites for cross-bridge heads

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