Lecture Quiz 5 (Chapter 9)

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Aerobic exercise results in all of the following EXCEPT

Increased size and strength of existing muscle cells.

Characteristics of isometric contractions include all but

shortening

Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________.

No muscle tension could be generated.

What is the role of calcium ions in muscle contraction?

Bind to regulatory sites on troponin to remove contraction inhibition

Which of the following statements is false or incorrect?

Cardiac muscle fibers depend mostly on anaerobic cellular respiration to generate ATP.

Which of the following statements is true?

Striated muscle cells are long and cylindrical with many nuclei.

The muscle cell membrane is called the

sarcolemma

What is the functional unit of a skeletal muscle called?

A sarcomere

A smooth, sustained contraction resulting from very rapid stimulation of the muscle in which no evidence of relaxation is seen, is called

fused tetanus

Most skeletal muscles contain ________.

A mixture of fiber types

The site where the motor nerve impulse is transmitted from the nerve endings to the skeletal muscle cell membranes are the

neuromuscular junctions

Myglobin has a special function in muscle tissues because it

holds a reserve supply of oxygen in the muscle

Which of the following is not a way muscle contractions can be graded?

Changing the type of muscle fibers involved in the contraction

Contraction elicited by a single bried stimulus is called

twitch

Which of the following is not a usual result of resistance exercise?

Increase in the number of muscle cells

What structure in skeletal muscle cells functions in calcium storage?

sarcoplasmic reticulum

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