Question 1

The process of engaging more motor units to increase the strength of a muscle contraction is called __________.

Accepted Answer

A)  wave summation
B)  recruitment
C)  temporal summation
D)  incomplete tetanus
E)  complete tetanusF) A) and D)
G) A) and C)

Question 2

Aerobic respiration produces approximately _________ more ATPs per glucose molecule than glycolysis does.

Accepted Answer

A)  12
B)  24
C)  36
D)  48
E)  100F) C) and E)
G) B) and D)

Question 3

Which of the following is true concerning isotonic eccentric contraction?

Accepted Answer

A)  The muscle shortens but tension remains constant.
B)  The muscle lengthens but tension remains constant.
C)  The muscle tenses and shortens.
D)  The muscle tenses but length remains unchanged.
E)  The muscle lengthens and tension declines.F) A) and B)
G) All of the above

Question 4

Exposure to the bacterium Clostridium tetani causes continuous release of acetylcholine.What effect does this have on smooth muscle?

Accepted Answer

A)  Flaccid paralysis
B)  Spastic paralysis
C)  Lockjaw
D)  No effect
E)  Myocardial atrophyF) B) and D)
G) B) and C)

Question 5

When a skeletal muscle lengthens,its __________ helps resist excessive stretching and subsequent injury to the muscle.

Accepted Answer

A)  thick filaments
B)  collagen
C)  actin
D)  troponin-tropomyosin complex
E)  varicositiesF) All of the above
G) A) and B)

Question 6

The absence or inhibition of acetylcholinesterase at a synapse would lead to __________.

Accepted Answer

A)  flaccid paralysis
B)  tetanus
C)  atrophy
D)  numbness
E)  muscle wastingF) All of the above
G) A) and E)

Question 7

Which of the following is not a characteristic of a muscle cell?

Accepted Answer

A)  Plasticity
B)  Contractility
C)  Conductivity
D)  Extensibility
E)  ExcitabilityF) A) and D)
G) All of the above

Question 8

Cardiac muscle has very little capacity for regeneration because it lacks __________.

Accepted Answer

A)  satellite cells
B)  an endomysium
C)  sarcomeres
D)  dense bodies
E)  somatic nerve fibersF) All of the above
G) C) and D)

Question 9

During muscle contraction,a single myosin head consumes ATP at a rate of about __________ ATP per second.

Accepted Answer

A)  1
B)  3
C)  5
D)  7
E)  9F) B) and D)
G) A) and B)

Question 10

A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.

Accepted Answer

A) True 
 B)False

Question 11

Michael Jordan was arguably the best player in professional basketball history.Scientifically,one would expect him to have highly developed __________ fibers.

Accepted Answer

A)  red
B)  white
C)  intermediate
D)  fast twitch
E)  slow oxidativeF) C) and E)
G) All of the above

Question 12

An isometric contraction does not change muscle length.

Accepted Answer

A) True 
 B)False

Question 13

Where is dystrophin,the protein that is defective in muscular dystrophy,normally found?

Accepted Answer

A)  Between the outermost myofilaments and the sarcolemma of a muscle fiber
B)  As a transmembrane protein of the sarcolemma
C)  In the Z discs of skeletal and cardiac muscle
D)  In the dense bodies of smooth muscle
E)  Bridging the gap between the sarcolemma and synaptic knobF) A) and E)
G) B) and C)

Question 14

How many muscle fibers stimulate one somatic motor neuron?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) C) and D)
G) B) and E)

Question 15

Which fibers are primarily responsible for producing lactic acid?

Accepted Answer

A)  Type I slow oxidative fibers
B)  Type IIA intermediate glycolytic fibers
C)  Type IIB fast glycolytic fibers
D)  Type I slow-twitch fibers
E)  Red fibersF) B) and C)
G) C) and E)

Question 16

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate.How do you suppose these drugs work?

Accepted Answer

A)  They prevent calcium from entering the sarcoplasmic reticulum of smooth muscle.
B)  They stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.
C)  They prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle.
D)  They prevent calcium from entering cardiac muscle, thus slowing down the heart rate.
E)  They prevent calcium from entering smooth muscle, thus allowing the muscle to relax.F) A) and C)
G) B) and E)

Question 17

As you are lifting a box,someone places extra weight on top of it.For your muscle to continue contracting and lifting the box,the muscle must __________.

Accepted Answer

A)  recruit more muscle fibers
B)  lower its threshold
C)  reduce its wave summation
D)  shift from isometric to isotonic contraction
E)  shift from slow-twitch to fast-twitch modeF) B) and E)
G) All of the above

Question 18

To stimulate muscle contraction,acetylcholine is released from the ___________ into the synaptic cleft.

Accepted Answer

A)  synaptic vesicles
B)  junctional folds
C)  sarcoplasmic reticulum
D)  sarcolemma
E)  terminal cisternaF) A) and E)
G) All of the above

Question 19

Which of the following systems would provide energy for a racquetball player,while playing a point?

Accepted Answer

A)  The respiratory system
B)  The glycolysis system
C)  The phosphagen system
D)  The anaerobic system
E)  The glycogen-lactic acid systemF) B) and E)
G) B) and C)

Question 20

Athletes who train at high altitudes increase their red blood cell count,which increases their oxygen supply during exercise.Increased oxygen supply results in __________.

Accepted Answer

A)  increased glycolysis
B)  increased use of myokinase
C)  longer aerobic respiration
D)  longer anaerobic fermentation
E)  reduced ATP consumptionF) A) and B)
G) A) and C)

Exam 11: Muscular Tissue

Where is dystrophin,the protein that is defective in muscular dystrophy,normally found?

Correct AnswerverifiedShow Answer

As you are lifting a box,someone places extra weight on top of it.For your muscle to continue contracting and lifting the box,the muscle must __________.

Correct AnswerverifiedShow Answer

Michael Jordan was arguably the best player in professional basketball history.Scientifically,one would expect him to have highly developed __________ fibers.

Correct AnswerverifiedShow Answer

The absence or inhibition of acetylcholinesterase at a synapse would lead to __________.

Correct AnswerverifiedShow Answer

Cardiac muscle has very little capacity for regeneration because it lacks __________.

Correct AnswerverifiedShow Answer

Which of the following is true concerning isotonic eccentric contraction?

Correct AnswerverifiedShow Answer

When a skeletal muscle lengthens,its __________ helps resist excessive stretching and subsequent injury to the muscle.

Correct AnswerverifiedShow Answer

During muscle contraction,a single myosin head consumes ATP at a rate of about __________ ATP per second.

Correct AnswerverifiedShow Answer

A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.

Correct AnswerverifiedShow Answer

Which fibers are primarily responsible for producing lactic acid?

Correct AnswerverifiedShow Answer

An isometric contraction does not change muscle length.

Correct AnswerverifiedShow Answer

The process of engaging more motor units to increase the strength of a muscle contraction is called __________.

Correct AnswerverifiedShow Answer

To stimulate muscle contraction,acetylcholine is released from the ___________ into the synaptic cleft.

Correct AnswerverifiedShow Answer

Which of the following systems would provide energy for a racquetball player,while playing a point?

Correct AnswerverifiedShow Answer

Athletes who train at high altitudes increase their red blood cell count,which increases their oxygen supply during exercise.Increased oxygen supply results in __________.

Correct AnswerverifiedShow Answer

How many muscle fibers stimulate one somatic motor neuron?

Correct AnswerverifiedShow Answer

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate.How do you suppose these drugs work?

Correct AnswerverifiedShow Answer

Which of the following is not a characteristic of a muscle cell?

Correct AnswerverifiedShow Answer

Exposure to the bacterium Clostridium tetani causes continuous release of acetylcholine.What effect does this have on smooth muscle?

Correct AnswerverifiedShow Answer

Aerobic respiration produces approximately _________ more ATPs per glucose molecule than glycolysis does.

Correct AnswerverifiedShow Answer

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