Question 1

The outside of the resting plasma membrane is ________ relative to the inside of the resting plasma membrane.

Accepted Answer

A)   positively charged
B)   negatively charged
C)   electrically neutral
D)   recharged
E)   None of these choices are correct.F) B) and D)
G) C) and D)

Question 2

Visceral smooth muscle

Accepted Answer

A)   may contain groups of cells that function as an independent unit.
B)   occurs in sheets and exhibits numerous gap junctions.
C)   contracts only when stimulated.
D)   does not function as a unit.
E)   All of these choices are correct.F) A) and B)
G) A) and C)

Question 3

Which type of muscle tissue is autorhythmic?

Accepted Answer

A)   Skeletal muscle
B)   Smooth muscle
C)   Cardiac muscle
D)   Both skeletal and cardiac muscle are correct.
E)   Both cardiac and smooth muscle are correct.F) C) and D)
G) A) and B)

Question 4

In a contracted muscle, the A bands narrow because the length of the myosin myofilaments changes.

Accepted Answer

A) True 
 B)False

Question 5

Increased strength of a trained muscle is due to

Accepted Answer

A)   an increased number of muscle fibers.
B)   the nervous system's ability to recruit a large number of motor units simultaneously.
C)   elimination of unnecessary enzymes and metabolic pathways.
D)   elimination of all adipose tissue.
E)   elimination of unnecessary connective tissue.F) B) and E)
G) A) and B)

Question 6

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

Accepted Answer

A)   Susan's metabolic rate was raised, and it initiated sweating.
B)   Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature.
C)   Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously.D) A) and B)
E) A) and C)

Question 7

In a laboratory experiment, the resting membrane potential of a muscle is measured and is found to be more negative. Which of the following has occurred?

Accepted Answer

A)   Hyperpolarization
B)   Repolarization
C)   Depolarization
D)   Isopolarization
E)   HypopolarizationF) A) and D)
G) A) and C)

Question 8

Which of the following statements about muscle tissue is true?

Accepted Answer

A)   Skeletal muscle is capable of spontaneous contraction.
B)   Smooth muscle is found in the walls of hollow organs.
C)   Cardiac muscle cells have multiple nuclei.
D)   Smooth muscle cells are long and cylindrical.
E)   There is a small amount of smooth muscle in the heart.F) A) and B)
G) B) and D)

Question 9

Identify the statement concerning skeletal muscle that is true.

Accepted Answer

A)   It comprises about 20% of the body's weight.
B)   It propels urine through the urinary tract.
C)   Its function is largely under involuntary control.
D)   It is a kind of connective tissue.
E)   It is responsible for locomotion.F) None of the above
G) C) and E)

Question 10

Which of the following statements regarding the sliding filament model is false?

Accepted Answer

A)   Actin and myosin do not shorten during contraction.
B)   Both actin and myosin myofilaments shorten during contraction.
C)   The sarcomere shortens.
D)   The I band and H zones become narrower during contraction.
E)   The A band remains constant in length.F) A) and B)
G) B) and E)

Question 11

Which of the following actions is caused by contraction of skeletal muscle?

Accepted Answer

A)   Contraction of the heart
B)   Moving your feet in walking
C)   Movement of food through the digestive tract
D)   Emptying of the urinary bladder
E)   VasoconstrictionF) A) and D)
G) B) and D)

Question 12

T tubules

Accepted Answer

A)   provide nutrients to the muscle fiber.
B)   generate new muscle fibers.
C)   conduct action potentials deep into the muscle fiber.
D)   release acetylcholine.
E)   store calcium ions.F) A) and D)
G) C) and D)

Question 13

A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called

Accepted Answer

A)   complete tetanus.
B)   incomplete tetanus.
C)   involuntary paralysis.
D)   all or none tetanus.
E)   treppe.F) C) and D)
G) B) and E)

Question 14

Which of the following statements concerning types of muscle contractions is false?

Accepted Answer

A)   In isometric contractions, the amount of tension produced by the muscle is constant.
B)   In isotonic contractions, the muscle fibers shorten.
C)   The contractile processes in isometric and isotonic contractions are the same.
D)   Most skeletal muscle contractions are a combination of isometric and isotonic contractions.
E)   In isotonic contractions, the amount of tension produced by the muscle fibers is constant during the contraction.F) B) and E)
G) C) and E)

Question 15

Depolarization of the plasma membrane occurs when there is a rapid influx (inflow)  of

Accepted Answer

A)   potassium ions.
B)   chloride ions.
C)   calcium ions.
D)   sodium ions.
E)   amino acids.F) All of the above
G) B) and C)

Question 16

Acetylcholine is released from the presynaptic terminal by the process of

Accepted Answer

A)   exocytosis.
B)   diffusion.
C)   phagocytosis.
D)   active transport.
E)   endocytosis.F) A) and B)
G) A) and C)

Question 17

Excitation-contraction coupling begins with

Accepted Answer

A)   the depolarization at the T tubules.
B)   the production of an action potential in the sarcolemma.
C)   the release of Ca2+ from the sarcoplasmic reticulum.
D)   the release of the cross-bridge.E) None of the above
F) C) and D)

Question 18

Tetanus of muscles is described as

Accepted Answer

A)   action potential frequency is high enough that no relaxation of muscle fibers occurs.
B)   a muscle produces constant tension during contraction.
C)   a muscle produces an increasing tension during contraction.
D)   a muscle produces increasing tension as it shortens.
E)   a muscle produces tension, but the length of the muscle is increasing.F) A) and E)
G) C) and D)

Question 19

Muscle tone

Accepted Answer

A)   is a time during which the tissue cannot respond again.
B)   results in complete and incomplete tetanus.
C)   is a condition in which the muscle fiber only partially relaxes between contractions.
D)   is a condition in which stimuli occur so rapidly that there are no intervening relaxations.
E)   is a constant tension produced by muscles for long periods of time.F) B) and C)
G) D) and E)

Question 20

An isotonic contraction is described as

Accepted Answer

A)   action potential frequency is high enough that no relaxation of muscle fibers occurs.
B)   a muscle produces constant tension during contraction.
C)   a muscle produces an increasing tension during contraction.
D)   a muscle produces increasing tension as it shortens.
E)   a muscle produces tension, but the length of the muscle is increasing.F) A) and D)
G) A) and C)

Exam 9: Muscular System: Histology and Physiology

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

Correct AnswerverifiedShow Answer

Which of the following actions is caused by contraction of skeletal muscle?

Correct AnswerverifiedShow Answer

Depolarization of the plasma membrane occurs when there is a rapid influx (inflow) of

Correct AnswerverifiedShow Answer

In a laboratory experiment, the resting membrane potential of a muscle is measured and is found to be more negative. Which of the following has occurred?

Correct AnswerverifiedShow Answer

Increased strength of a trained muscle is due to

Correct AnswerverifiedShow Answer

Which type of muscle tissue is autorhythmic?

Correct AnswerverifiedShow Answer

Identify the statement concerning skeletal muscle that is true.

Correct AnswerverifiedShow Answer

Which of the following statements about muscle tissue is true?

Correct AnswerverifiedShow Answer

Which of the following statements concerning types of muscle contractions is false?

Correct AnswerverifiedShow Answer

A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called

Correct AnswerverifiedShow Answer

T tubules

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An isotonic contraction is described as

Correct AnswerverifiedShow Answer

Tetanus of muscles is described as

Correct AnswerverifiedShow Answer

Muscle tone

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Excitation-contraction coupling begins with

Correct AnswerverifiedShow Answer

In a contracted muscle, the A bands narrow because the length of the myosin myofilaments changes.

Correct AnswerverifiedShow Answer

The outside of the resting plasma membrane is ________ relative to the inside of the resting plasma membrane.

Correct AnswerverifiedShow Answer

Visceral smooth muscle

Correct AnswerverifiedShow Answer

Acetylcholine is released from the presynaptic terminal by the process of

Correct AnswerverifiedShow Answer

Which of the following statements regarding the sliding filament model is false?

Correct AnswerverifiedShow Answer

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