Question 1

The only energy source that can be used directly by the contractile machinery of a muscle fibre is ____________________.

Accepted Answer

The answer of The only energy source that can be...

Question 2

Which statement is correct for the T tubules?

Accepted Answer

A)   They form the Z lines.
B)   They store Ca2+.
C)   They provide a means of rapidly transmitting the action potential to the central portions of the muscle fibre.
D)   They allow for nutrients to be carried into the cell.

Question 3

Where does a muscle originate?

Accepted Answer

A)   main, thick part of the structure
B)   middle, thin part of the structure
C)   movable end of attachment
D)   stationary end of attachment

Question 4

What causes the striated appearance of skeletal muscle?

Accepted Answer

A)   regular arrangement of the T tubules running transversely through the muscle fibre
B)   presence of the Z lines extending down the middle of the I bands
C)   presence of gap junctions
D)   regular arrangement of highly organized thick and thin filaments

Question 5

Skeletal muscles are capable of limited repair after injury.

Accepted Answer

A) True 
 B)False

Question 6

Indicate which bands are being described in each statement by writing the appropriate letter(s)  in the blank by using the answer code (options may be used more than once or not at all) .
-remains the same size during muscle contraction

Accepted Answer

A)  A band
B)  I band
C)  H zone

Question 7

What 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 activity

Question 8

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) .
-tension remains constant

Accepted Answer

A)  isometric contraction
B)  isotonic contraction

Question 9

Which statement concerning the length-tension relationship of skeletal muscle is INCORRECT?

Accepted Answer

A)   When a muscle is maximally stretched, it can develop the most tension upon contraction because the thin filaments can slide a maximal distance.
B)   Maximum tension can be developed if the muscle is at its lowest at the onset of contraction.
C)   In the body, the relaxed length of muscle is at its optimal length.
D)   When the initial length of muscle prior to contraction becomes very short, tension is decreased during contraction because of thin filament overlap, because the thick filaments are compressed against the Z lines, and because not as much Ca2+is released during excitation-contraction coupling.

Question 10

Ligaments attach muscles to bones.

Accepted Answer

A) True 
 B)False

Question 11

What is NOT a method of gradation of skeletal muscle contraction?

Accepted Answer

A)   twitch summation
B)   motor unit recruitment
C)   stimulating variable portions of each motor unit
D)   varying the number of motor units stimulated

Question 12

Which events involved in muscle cell contraction are sequenced in the correct order?
1) Sodium channels open,allowing sodium to flow in.
2) Impulse reaches axon's synaptic knob.
3) ACh binds to receptors on sarcolemma.
4) Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis.
5) If enough sodium moves into the muscle cell,an impulse (action potential) develops.

Accepted Answer

A)   1, 2, 3, 4, 5
B)   2, 1, 3, 4, 5
C)   2, 4, 3, 1, 5
D)   3, 4, 5, 1, 2

Question 13

What is the functional unit of skeletal muscle?

Accepted Answer

A)   largest contractile component of a muscle fibre
B)   area between two Z lines
C)   sarcoplasmic reticulum
D)   area between two I bands

Question 14

Which statement concerning in twitch summation is correct?

Accepted Answer

A)   The muscle fibre is stimulated again before the action potential has returned to resting potential.
B)   The muscle fibre is stimulated again before the filaments have completely returned to their resting position.
C)   Stronger muscle contractions occur with stronger action potentials.
D)   Weaker muscle contractions in spite of stronger action potentials.

Question 15

Muscle fibres are some of the longest cells in the body.How long can they be?

Accepted Answer

A)   1 to 2 micrometres
B)   2 to 4 micrometres
C)   10 to 100 micrometres
D)   500 to 1,000 micrometres

Question 16

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) .
-shape consists of two globular heads attached to a tail

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 tropomyosin

Question 17

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) .
-contains partially overlapping thick and thin filaments

Accepted Answer

A)  Z line
B)  A band
C)  I band
D)  H zone

Question 18

The ____________________ component is the noncontractile tissue part of a muscle.

Accepted Answer

The answer of The ____________________ component is the noncontractile tissue...

Question 19

Which statement is correct about the summation of simple twitches?

Accepted Answer

A)   They can occur from the long duration of the action potential in a muscle fibre.
B)   They reduce the tension in a muscle.
C)   They result from the slow stimulation of a muscle fibre.
D)   The twitches from action potentials add together.

Question 20

____________________ provide the most ATP molecules for use by muscle fibres contracting over a long period of time.

Accepted Answer

Oxidative ...

Exam 6: Muscle Physiology

Ligaments attach muscles to bones.

Correct Answer
verified

Which statement is correct about the summation of simple twitches?

Correct Answer
verified

What is NOT a method of gradation of skeletal muscle contraction?

Correct Answer
verified

Which statement concerning in twitch summation is correct?

Correct Answer
verified

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -shape consists of two globular heads attached to a tail

Correct Answer
verified

What is the functional unit of skeletal muscle?

Correct Answer
verified

What results from disruption of a motor system that supplies inhibitory presynaptic inputs to motor neurons?

Correct Answer
verified

Which statement is correct for the T tubules?

Correct Answer
verified

What causes the striated appearance of skeletal muscle?

Correct Answer
verified

Skeletal muscles are capable of limited repair after injury.

Correct Answer
verified

Muscle fibres are some of the longest cells in the body.How long can they be?

Correct Answer
verified

The ____________________ component is the noncontractile tissue part of a muscle.

Correct Answer
verified

Correct Answer
verified

Which statement concerning the length-tension relationship of skeletal muscle is INCORRECT?

Correct Answer
verified

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -tension remains constant

Correct Answer
verified

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -remains the same size during muscle contraction

Correct Answer
verified

Where does a muscle originate?

Correct Answer
verified

____________________ provide the most ATP molecules for use by muscle fibres contracting over a long period of time.

Correct Answer
verified
Oxidative ...
View Answer

The only energy source that can be used directly by the contractile machinery of a muscle fibre is ____________________.

Correct Answer
verified

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -contains partially overlapping thick and thin filaments

Correct Answer
verified

Exam 6: Muscle Physiology

Ligaments attach muscles to bones.

Correct AnswerverifiedShow Answer

Which statement is correct about the summation of simple twitches?

Correct AnswerverifiedShow Answer

What is NOT a method of gradation of skeletal muscle contraction?

Correct AnswerverifiedShow Answer

Which statement concerning in twitch summation is correct?

Correct AnswerverifiedShow Answer

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -shape consists of two globular heads attached to a tail

Correct AnswerverifiedShow Answer

What is the functional unit of skeletal muscle?

Correct AnswerverifiedShow Answer

What results from disruption of a motor system that supplies inhibitory presynaptic inputs to motor neurons?

Correct AnswerverifiedShow Answer

Which statement is correct for the T tubules?

Correct AnswerverifiedShow Answer

What causes the striated appearance of skeletal muscle?

Correct AnswerverifiedShow Answer

Skeletal muscles are capable of limited repair after injury.

Correct AnswerverifiedShow Answer

Muscle fibres are some of the longest cells in the body.How long can they be?

Correct AnswerverifiedShow Answer

The ____________________ component is the noncontractile tissue part of a muscle.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement concerning the length-tension relationship of skeletal muscle is INCORRECT?

Correct AnswerverifiedShow Answer

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -tension remains constant

Correct AnswerverifiedShow Answer

Indicate which bands are being described in each statement by writing the appropriate letter(s) in the blank by using the answer code (options may be used more than once or not at all) . -remains the same size during muscle contraction

Correct AnswerverifiedShow Answer

Where does a muscle originate?

Correct AnswerverifiedShow Answer

____________________ provide the most ATP molecules for use by muscle fibres contracting over a long period of time.

Correct AnswerverifiedOxidative ...View AnswerShow Answer

The only energy source that can be used directly by the contractile machinery of a muscle fibre is ____________________.

Correct AnswerverifiedShow Answer

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -contains partially overlapping thick and thin filaments

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Oxidative ...
View Answer

Correct Answer
verified

Correct Answer
verified