Question 1

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

Question 2

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

Accepted Answer

Oxidative

Question 3

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

Question 4

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

Question 5

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. 
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 6

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

Question 7

Skeletal muscles are capable of limited repair after injury.

Accepted Answer

A) True 
 B)False

Question 8

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 
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 9

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 
A) isometric contraction 
B) isotonic contraction

Question 10

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 
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 11

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. 
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 12

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 tropomyosin
F)actin, myosin, troponin, and tropomyosin 
A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin

Question 13

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. 
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 14

Ligaments attach muscles to bones.

Accepted Answer

A) True 
 B)False

Question 15

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 16

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

Accepted Answer

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

Question 17

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. 
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 18

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

Question 19

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 
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 20

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 
A)  uncoordinated, clumsy movements 
B)  spastic paralysis 
C)  paraplegia 
D)  suppression of reflex activity

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

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

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

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

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

What is the functional unit of skeletal muscle?

Skeletal muscles are capable of limited repair after injury.

Where does a muscle originate?

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

Which statement is correct for the T tubules?

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

Which statement is correct about the summation of simple twitches?

Ligaments attach muscles to bones.

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

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

Which statement concerning in twitch summation is correct?

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

What causes the striated appearance of skeletal muscle?

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

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System

Principals of Endocrinology; The Central Endocrine Glands

Cardiac Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

The Urinary System

Fluid and Acid Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine Glands

The Reproductive System

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Exam 6: Muscle Physiology

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

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

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

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

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

What is the functional unit of skeletal muscle?

Skeletal muscles are capable of limited repair after injury.

Where does a muscle originate?

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

Which statement is correct for the T tubules?

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

Which statement is correct about the summation of simple twitches?

Ligaments attach muscles to bones.

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

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

Which statement concerning in twitch summation is correct?

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

What causes the striated appearance of skeletal muscle?

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

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System

Principals of Endocrinology; The Central Endocrine Glands

Cardiac Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

The Urinary System

Fluid and Acid Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine Glands

The Reproductive System

Filters