Exam 17: Muscle Contraction

Which of the following statements is incorrect about motor units?

The T-tubules in the heart form dyads rather than the triads found in skeletal muscles.

A contraction in which the tension within the muscle remains the same but the length changes is called a(n) _____ contraction.

Susie Swift, an avid jogger, is running down the beach when she comes upon Bobby Beachbum, a serious weight lifter. Bobby flirts with Susie, who decides he has more muscle than brains. She continues her run down the beach, and Bobby begins to run after her. After about a half mile, Bobby tires and gives up. Explain why Susie was able to continue to run despite having less muscle mass than Bobby has.

Muscle cells produce heat by the process of catabolism.

During the latent period of muscle contraction, the impulse is transmitted from the sarcolemma to the sarcomere.

Which part of the sarcomere stays almost the same size during contraction?

The myofilament that can be described as a globular protein strung together like beads to form two intertwined strands is:

Skeletal muscles are innervated by:

Which structure functions to temporarily store calcium ions?

Match each term with its corresponding definition or description. -A segment of the myofilament between two Z-lines

Explain how glycogen and myoglobin aid in muscle contraction.

T-tubules are perpendicular to muscle fibers.

The substance that attracts oxygen in the myoglobin molecule is:

The chief function of the T-tubules is to:

Cardiac muscle is similar to skeletal muscle in that both form strong, electrically coupled junctions with other fibers.

Thick myofilaments extend the length of the:

White fibers are also called _____ fibers.

Rigor mortis occurs because of damage done to the sarcolemma after death.

Which of the following is not associated with the thin myofilament?