Which of the following is not characteristic of smooth muscle?
A) The striations are due to the orderly arrangement of actin and myosin.
B) Neurons that innervate smooth muscles are under involuntary control.
C) Smooth muscle cells are uninucleate.
D) Smooth muscles do not contain sarcomeres.
E) The thin filaments of smooth muscle fibers are attached to dense bodies.
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Question 2) The ability of smooth muscle to function over a wide range of lengths is called
A) elasticity.
B) contractility.
C) extensibility.
D) plasticity.
E) variability.
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Question 3) Which of the following is not an effect of aging on the muscular system?
A) hypertrophy
B) smaller muscle fibers
C) decreased recovery from muscle injuries
D) exercise tolerance decreases
E) muscles become less elastic
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Question 4) Which of the following types of muscle fibers are best adapted for prolonged contraction such as standing all day?
A) uninucleated fibers
B) striated fibers
C) fast fibers
D) slow fibers
E) intermediate fibers
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Question 5) Large-diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of
A) slow fibers.
B) intermediate fibers.
C) fast fibers.
D) red muscles.
E) fatty muscles.
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Question 6) Which of the following statements is/are false regarding human muscles?
A) Most have both slow and fast fibers.
B) Slow fibers are abundant in the muscles of the hand.
C) Eye muscles are composed entirely of fast fibers.
D) Slow fibers are abundant in the back muscles.
E) All of the answers are correct; none of them are true regarding human muscles.
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Question 7) Muscles that move the eyeball have ________ fibers.
A) fast
B) slow
C) intermediate
D) circular
E) All of the answers are correct.
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Question 8) Fast fibers
A) have low resistance to fatigue.
B) rely on aerobic metabolism.
C) have many mitochondria.
D) have twitches with a very brief contraction phase.
E) have low resistance to fatigue and quick twitches.
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Question 9) The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
A) fast
B) slow
C) intermediate
D) anaerobic
E) high-density
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Question 10) Heat energy gained from muscle contraction is released by the ________ system.
A) integumentary
B) respiratory
C) cardiovascular
D) urinary
E) endocrine