Question 1

Which statement best describes the goal of medications used to treat myasthenia gravis?

Accepted Answer

A)   To increase the number of acetylcholine receptors
B)   To decrease the number of synaptic vesicles
C)   To promote multiple motor unit summation
D)   To inhibit Ca2+ release from the sarcoplasmic reticulum
E)   To inhibit the function of cholinesteraseF) A) and E)
G) A) and D)

Question 2

Why does one continue to breathe heavy after rigorous physical activity has stopped?

Accepted Answer

A)   The diaphragm is waiting for its acetylcholine to run out.
B)   The body requires more oxygen to restore levels of ATP and creatine phosphate.
C)   The lungs can't stop breathing until the heart rate slows down.
D)   Myosin heads need more oxygen to fully detach from actin.
E)   The kidneys require oxygen to dispose of excess lactate.F) All of the above
G) None of the above

Question 3

Which of the following best describes the resting membrane potential (RMP) ?

Accepted Answer

A)   The intracellular environment is negatively charged.
B)   The intracellular environment has more positively charged sodium.
C)   The extracellular environment is negatively charged.
D)   It has a voltage of about +75 mV.
E)   It is dependent upon the absorption of potassium ions by the muscle fiber.F) A) and D)
G) B) and E)

Question 4

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 cisternsF) All of the above
G) B) and C)

Question 5

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 B)
G) A) and E)

Question 6

How many muscle fibers stimulate one somatic motor neuron?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) All of the above
G) B) and C)

Question 7

Skeletal muscle is called ___________,because it is usually subject to conscious control.

Accepted Answer

A)   excitable
B)   contractile
C)   striated
D)   voluntary
E)   isometricF) None of the above
G) All of the above

Question 8

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

Accepted Answer

A)   They link the thin filaments to the inside of the sarcolemma in smooth muscle.
B)   They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down.
C)   They enable each cardiomyocyte to directly stimulate its neighbors.
D)   They release neurotransmitter molecules onto smooth muscle cells.
E)   They prevent single-unit smooth muscle cells from pulling apart.F) B) and C)
G) A) and E)

Question 9

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) A) and D)
G) C) and D)

Question 10

The transfer of phosphate from CP to ADP is catalyzed by __________.

Accepted Answer

A)   myokinase
B)   creatinine
C)   cAMP
D)   creatine kinase
E)   ATPF) A) and B)
G) A) and E)

Question 11

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch,the most likely result will be __________.

Accepted Answer

A)   fatigue
B)   spasm
C)   incomplete tetanus
D)   complete tetanus
E)   flaccid paralysisF) A) and C)
G) None of the above

Question 12

80% of the lactate produced by skeletal muscle is converted to pyruvate by the __________.

Accepted Answer

A)   kidneys
B)   liver
C)   muscle tissue
D)   sarcoplasmic reticulum
E)   neuromuscular junctionF) C) and E)
G) C) and D)

Question 13

Which fibers are primarily responsible for producing lactate?

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 E)
G) D) and E)

Question 14

Loss of muscle mass from lack of activity is called __________.

Accepted Answer

A)   myopathy
B)   dystrophy
C)   apathy
D)   atrophy
E)   tetanusF) A) and B)
G) A) and D)

Question 15

Where would you expect to find numerous gap junctions in muscular tissue?

Accepted Answer

A)   The sarcoplasmic reticulum of skeletal muscle
B)   The A bands of skeletal and cardiac muscle
C)   The sarcolemma of skeletal muscle
D)   The intercalated discs of cardiac muscle
E)   Multiunit smooth muscleF) A) and C)
G) C) and E)

Question 16

The axon terminal releases acetylcholine into the synaptic cleft,which is received by receptors on the motor end plate.Which structure does this describe?

Accepted Answer

A)   A sarcomere
B)   The thick filament
C)   The varicosity of a smooth muscle cell
D)   The neuromuscular junction of a skeletal muscle
E)   A motor unitF) C) and D)
G) A) and C)

Question 17

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-lactate systemF) B) and D)
G) A) and C)

Question 18

Which of the following marks the boundaries of a sarcomere?

Accepted Answer

A)   I bands
B)   H bands
C)   Z discs
D)   M lines
E)   A bandsF) A) and D)
G) C) and D)

Question 19

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Accepted Answer

A) True 
 B)False

Question 20

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) None of the above
G) A) and D)

Exam 11: Muscular Tissue

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Correct AnswerverifiedShow Answer

How many muscle fibers stimulate one somatic motor neuron?

Correct AnswerverifiedShow Answer

The transfer of phosphate from CP to ADP is catalyzed by __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following marks the boundaries of a sarcomere?

Correct AnswerverifiedShow Answer

Skeletal muscle is called ___________,because it is usually subject to conscious control.

Correct AnswerverifiedShow Answer

Loss of muscle mass from lack of activity is called __________.

Correct AnswerverifiedShow Answer

Which of the following best describes the resting membrane potential (RMP) ?

Correct AnswerverifiedShow Answer

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

Correct AnswerverifiedShow Answer

Which statement best describes the goal of medications used to treat myasthenia gravis?

Correct AnswerverifiedShow Answer

The axon terminal releases acetylcholine into the synaptic cleft,which is received by receptors on the motor end plate.Which structure does this describe?

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

80% of the lactate produced by skeletal muscle is converted to pyruvate by the __________.

Correct AnswerverifiedShow Answer

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch,the most likely result will be __________.

Correct AnswerverifiedShow Answer

Why does one continue to breathe heavy after rigorous physical activity has stopped?

Correct AnswerverifiedShow Answer

Which fibers are primarily responsible for producing lactate?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Where would you expect to find numerous gap junctions in muscular tissue?

Correct AnswerverifiedShow Answer

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