Question 1

A(n) ____________________ is a motor neuron and all the muscle fibres it recruits.

Accepted Answer

The answer of A(n) ____________________ is a motor neuron and...

Question 2

Which of the following provides the energy for cross-bridge cycling during muscle contraction

Accepted Answer

A)  acetylcholine
B)  Ca²⁺
C)  ATP
D)  myosinE) All of the above
F) A) and B)

Question 3

Which of these statements describes muscle tension

Accepted Answer

A)  It is created during muscle contraction as the tension generated by the contractile elements is transmitted via the connective tissue and tendons to the bones.
B)  It is the force exerted on a muscle by the weight of an object.
C)  It is greater than the load tension during an isometric contraction.
D)  It is less than the load tension during isometric contraction.E) B) and C)
F) None of the above

Question 4

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) 
-found in thick filament

Accepted Answer

A)  actin only
B)  myosin only
C)  actin and myosin
D)  troponin-tropomyosin complex
E)  actin, troponin, and tropomyosinF) actin, myosin, troponin, and tropomyosinG) D) and E)
H) B) and E)

Question 5

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) 
-maintain(s)  a constant resting membrane potential unless stimulated

Accepted Answer

A)  skeletal muscle only
B)  single-unit smooth muscle only
C)  cardiac muscle only
D)  skeletal muscle and cardiac muscle
E)  skeletal muscle and single-unit smooth muscleF) single-unit smooth muscle and cardiac muscleG) skeletal, single-unit smooth, and cardiac musclesH) A) and B)
I) B) and G)

Question 6

What can activate the stretch receptors in the central portion of the muscle spindle

Accepted Answer

A)  passive stretch of the skin overlying the muscle
B)  contraction of the central portions of the muscle fibre
C)  gamma motor neuron stimulation
D)  an alpha motor neuronE) B) and C)
F) B) and D)

Question 7

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) 
-contain(s)  actin, myosin, troponin, and tropomyosin

Accepted Answer

A)  skeletal muscle only
B)  single-unit smooth muscle only
C)  cardiac muscle only
D)  skeletal muscle and cardiac muscle
E)  skeletal muscle and single-unit smooth muscleF) single-unit smooth muscle and cardiac muscleG) skeletal, single-unit smooth, and cardiac musclesH) B) and G)
I) D) and G)

Question 8

How does contraction of smooth muscle differ from that of skeletal muscle

Accepted Answer

Smooth muscle contraction and skeletal m...

Question 9

ATP expenditure is required for both contraction and relaxation of a muscle fibre.

Accepted Answer

A) True 
 B)False

Question 10

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) 
-has/have a clear-cut, length-tension relationship

Accepted Answer

A)  skeletal muscle only
B)  single-unit smooth muscle only
C)  cardiac muscle only
D)  skeletal muscle and cardiac muscle
E)  skeletal muscle and single-unit smooth muscleF) single-unit smooth muscle and cardiac muscleG) skeletal, single-unit smooth, and cardiac musclesH) B) and C)
I) E) and G)

Question 11

Which of these events results from disruption of a motor system that supplies inhibitory presynaptic inputs to motor neurons

Accepted Answer

A)  uncoordinated, clumsy movements
B)  spastic paralysis
C)  paraplegia
D)  suppression of reflex activityE) C) and D)
F) None of the above

Question 12

The source of calcium in smooth muscle is the ____________________.

Accepted Answer

The answer of The source of calcium in smooth muscle...

Question 13

All skeletal muscles are attached to the skeleton.

Accepted Answer

A) True 
 B)False

Question 14

Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.) 
-composed of thick and thin filaments

Accepted Answer

A)  A band
B)  I band
C)  H zoneD) All of the above
E) B) and C)

Question 15

The lever system at the elbow joint provides a mechanical advantage so that, when the biceps muscle contracts to flex the elbow joint and lift an object in the hand, the force developed in the biceps can be considerably less than the actual load that is moved.

Accepted Answer

A) True 
 B)False

Question 16

What is the first means by which ATP is produced at the onset of contractile activity

Accepted Answer

A)  transfer of energy and phosphate from creatine phosphate to ADP
B)  oxidative phosphorylation
C)  glycolysis
D)  degradation of myoglobinE) A) and D)
F) A) and C)

Question 17

Match the types of muscles, labelled a. and b., with the characteristics.
-tension remains constant

Accepted Answer

A)  isometric contraction
B)  isotonic contractionC) A) and B)
D) undefined

Question 18

What is the cause of enlargement of muscle due to weight lifting

Accepted Answer

A)  hypotrophy
B)  hyperplasia
C)  increased production of actin and myosin
D)  dystrophyE) A) and B)
F) A) and C)

Question 19

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) 
-requires a constant supply of oxygen

Accepted Answer

A)  slow-oxidative fibre
B)  fast-oxidative fibre
C)  fast-glycolytic fibreD) A) and C)
E) All of the above

Question 20

What happens during coactivation

Accepted Answer

A)  All the muscle fibres in a skeletal muscle are activated simultaneously.
B)  The gamma motor-neuron and alpha motor-neuron systems to a skeletal muscle are activated simultaneously.
C)  All the cross bridges within a single skeletal muscle are activated simultaneously.
D)  The primary (annulospiral)  and secondary (flower-spray)  endings within a muscle spindle are activated simultaneously.E) A) and D)
F) C) and D)

Exam 7: Muscle Physiology

The lever system at the elbow joint provides a mechanical advantage so that, when the biceps muscle contracts to flex the elbow joint and lift an object in the hand, the force developed in the biceps can be considerably less than the actual load that is moved.

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Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -requires a constant supply of oxygen

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What happens during coactivation

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Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) -maintain(s) a constant resting membrane potential unless stimulated

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Which of these events results from disruption of a motor system that supplies inhibitory presynaptic inputs to motor neurons

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What is the cause of enlargement of muscle due to weight lifting

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What can activate the stretch receptors in the central portion of the muscle spindle

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Which of the following provides the energy for cross-bridge cycling during muscle contraction

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Match the types of muscles, labelled a. and b., with the characteristics. -tension remains constant

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The source of calcium in smooth muscle is the ____________________.

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Which of these statements describes muscle tension

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A(n) ____________________ is a motor neuron and all the muscle fibres it recruits.

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Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -found in thick filament

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Match the bands, labelled a. through c., with the descriptions. (Options may be used more than once or not at all.) -composed of thick and thin filaments

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ATP expenditure is required for both contraction and relaxation of a muscle fibre.

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Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) -contain(s) actin, myosin, troponin, and tropomyosin

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How does contraction of smooth muscle differ from that of skeletal muscle

Correct AnswerAnswered by ExamLex AISmooth muscle contraction and skeletal m...View AnswerShow Answer

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) -has/have a clear-cut, length-tension relationship

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What is the first means by which ATP is produced at the onset of contractile activity

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All skeletal muscles are attached to the skeleton.

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Smooth muscle contraction and skeletal m...
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