Question 1

Which type of muscle tissue has spindle-shaped cells?

Accepted Answer

A)   skeletal muscle
B)   smooth muscle
C)   cardiac muscle
D)   both skeletal and cardiac muscle
E)   both cardiac and smooth muscleF) A) and C)
G) B) and C)

Question 2

Which of the following will respond to a threshold stimulus with an all-or-none contraction?

Accepted Answer

A)   a single muscle fiber
B)   a single motor unit
C)   a whole muscle
D)   a single muscle fiber and a single motor unit
E)   a single muscle fiber, a single motor unit, and a whole muscleF) C) and E)
G) A) and C)

Question 3

Complete tetanus

Accepted Answer

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

Question 4

-The figure illustrates a detailed drawing of the neuromuscular junction. What does "B" represent?

Accepted Answer

A)   synaptic vesicles
B)   synaptic cleft
C)   sarcolemma
D)   presynaptic terminal
E)   postsynaptic membraneF) C) and D)
G) All of the above

Question 5

-What does "A" represent on the diagram?

Accepted Answer

A)   myosin myofilament
B)   actin myofilament
C)   sarcomere
D)   Z disk
E)   cross-bridgeF) A) and D)
G) A) and C)

Question 6

Which of the following events occurs on the postsynaptic membrane?

Accepted Answer

A)   acetylcholine production
B)   rapid degradation of acetylcholine
C)   release of neurotransmitter
D)   neurotransmitter combines with a receptor molecule
E)   release of calcium ionsF) All of the above
G) None of the above

Question 7

In which of the following situations does a resting membrane potential exist?

Accepted Answer

A)   a relaxed muscle fiber
B)   a conducting neuron
C)   a stimulated sensory receptor in the skin
D)   a contracting cardiac muscle cell
E)   the eye seeing an imageF) B) and E)
G) D) and E)

Question 8

Which of the following helps explain the increased tension seen in multiple wave summation?

Accepted Answer

A)   increased motor unit recruitment
B)   increased concentration of calcium ions around the myofibrils
C)   exposure of more active sites on myosin myofilaments
D)   the breakdown of elastic elements in the cell
E)   decreased stimulus frequencyF) A) and D)
G) D) and E)

Question 9

Identify the statement concerning general functional characteristics of muscle that is true.

Accepted Answer

A)   Muscle tissue shortens forcefully but lengthens passively.
B)   Muscle tissue shortens passively but lengthens forcefully.
C)   Muscle tissue can get shorter, but can not get longer.
D)   Muscle tissue can get longer, but can not get shorter.
E)   None of these statements are true.F) A) and E)
G) A) and B)

Question 10

Randy is participating in a strong man competition and is required to pull a yacht as far as he can. Which type of chemical process will his skeletal muscles rely on during this competition?

Accepted Answer

A)   anaerobic respiration
B)   aerobic respiration
C)   both anaerobic and aerobic respirationD) A) and C)
E) All of the above

Question 11

The plasma membrane of an excitable cell is more permeable to potassium ions because

Accepted Answer

A)   of its positive electrical charge.
B)   there are more leak ion channels for K+ than Na+.
C)   protein molecules cannot exit through the cell membrane.
D)   calcium ions block Na+ and Cl- channels.
E)   there are more gated channels for K+.F) A) and B)
G) B) and D)

Question 12

Troponin

Accepted Answer

A)   has two subunits.
B)   is part of the myosin myofilament.
C)   is a long, flexible protein.
D)   has a calcium-binding site.
E)   binds to ATP.F) A) and E)
G) A) and D)

Question 13

Callie is a world class marathon runner. Which of the descriptions about her dominant type of skeletal muscle is FALSE?

Accepted Answer

A)   They split ATP slowly.
B)   They have large deposits of myoglobin.
C)   They are well adapted to anaerobic activity.
D)   They have a well developed blood supply.
E)   They have low glycogen stores.F) D) and E)
G) C) and E)

Question 14

Smooth muscle

Accepted Answer

A)   responds in an all-or-none fashion.
B)   depolarizes when both sodium and calcium ions diffuse into the cell.
C)   has fast waves of depolarization.
D)   has fast waves of repolarization.
E)   has a resting membrane potential that is more negative than skeletal muscle fibers.F) None of the above
G) D) and E)

Question 15

Which of the following is NOT a known effect of illegal use of anabolic steroids in large dosages?

Accepted Answer

A)   increased muscle size
B)   kidney damage
C)   diminished testosterone secretion
D)   increased cardiovascular fitness
E)   sterilityF) A) and C)
G) A) and B)

Question 16

Which of the following is true?

Accepted Answer

A)   The greater the overlap of actin and myosin, the stronger the contraction.
B)   Overstretching a muscle will increase its tension.
C)   Optimal actin and myosin overlap will produce maximal contraction.
D)   The greatest amount of tension is achieved when actin and myosin do not overlap.
E)   Tension is great when actin and myosin overlap as much as they can.F) A) and D)
G) A) and C)

Question 17

One ATP molecule is required for

Accepted Answer

A)   formation of the cross-bridge.
B)   movement of the cross-bridge.
C)   release of the cross-bridge.
D)   formation of the cross-bridge and for movement of the cross-bridge.
E)   formation of the cross-bridge, for movement of the cross-bridge, and for release of the cross-bridge.F) B) and C)
G) A) and E)

Question 18

Concentric contractions occur when

Accepted Answer

A)   the muscle produces increasing tension as it shortens.
B)   the tension and length of the muscle remain constant during a contraction.
C)   tension in a muscle is maintained while the muscle increases in length.
D)   the muscle produces tension while the length of the muscle increases.
E)   isometric contractions occur.F) A) and B)
G) B) and E)

Question 19

A sarcomere extends from

Accepted Answer

A)   one Z disk to an adjacent Z disk.
B)   one T tubule to the next T tubule.
C)   the middle of the I band to the middle of the A band.
D)   the H zone to the I band.
E)   the M line to the next M line.F) A) and D)
G) B) and D)

Question 20

What type of muscle tissue causes peristalsis?

Accepted Answer

A)   skeletal muscle
B)   smooth muscle
C)   cardiac muscleD) A) and B)
E) A) and C)

Exam 9: Muscular System: Histology and Physiology

Smooth muscle

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Concentric contractions occur when

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A sarcomere extends from

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Which of the following helps explain the increased tension seen in multiple wave summation?

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What type of muscle tissue causes peristalsis?

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Callie is a world class marathon runner. Which of the descriptions about her dominant type of skeletal muscle is FALSE?

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Which of the following is true?

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Which of the following events occurs on the postsynaptic membrane?

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Identify the statement concerning general functional characteristics of muscle that is true.

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Complete tetanus

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In which of the following situations does a resting membrane potential exist?

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One ATP molecule is required for

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Which type of muscle tissue has spindle-shaped cells?

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The plasma membrane of an excitable cell is more permeable to potassium ions because

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-What does "A" represent on the diagram?

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Which of the following is NOT a known effect of illegal use of anabolic steroids in large dosages?

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Which of the following will respond to a threshold stimulus with an all-or-none contraction?

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Troponin

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-The figure illustrates a detailed drawing of the neuromuscular junction. What does "B" represent?

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Randy is participating in a strong man competition and is required to pull a yacht as far as he can. Which type of chemical process will his skeletal muscles rely on during this competition?

Correct AnswerverifiedShow Answer

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