Question 1

The increase in the number of motor units activated as a result of more intense stimulation is called

Accepted Answer

A)   latency.
B)   recruitment.
C)   threshold stimulation.
D)   all-or-none response.
E)   summation.F) None of the above
G) C) and D)

Question 2

The zygomaticus muscle

Accepted Answer

A)   inserts on the coronoid process of the mandible.
B)   elevates the corner of the mouth.
C)   brings the head into an upright position.
D)   closes the lips.E) A) and C)
F) None of the above

Question 3

In this type of muscle cell,the sarcoplasmic reticulum is not well developed.

Accepted Answer

A)   cardiac
B)   skeletal
C)   smoothD) A) and C)
E) All of the above

Question 4

Acetylcholinesterase decomposes the crossbridge linkages of myosin to actin.

Accepted Answer

A) True 
 B)False

Question 5

The moveable end of a muscle is attached at its

Accepted Answer

A)   origin.
B)   fulcrum.
C)   insertion.
D)   motor end plate.
E)   source.F) B) and D)
G) A) and C)

Question 6

In the absence of oxygen,small amounts of ATP may be generated by this process.

Accepted Answer

A)   electron transport chain
B)   glycolysis
C)   citric acid cycle
D)   hydrolysis of myoglobinE) A) and B)
F) A) and C)

Question 7

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Accepted Answer

A) True 
 B)False

Question 8

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Accepted Answer

The answer of The two neurotransmitters that affect smooth muscle...

Question 9

When a muscle is stimulated repeatedly so that it cannot completely relax between contractions,_________ occurs.

Accepted Answer

A)   muscle fatigue
B)   complete tetanic contraction
C)   summation
D)   peristalsisE) B) and C)
F) C) and D)

Question 10

This molecule,only present in muscle cells,is used to temporarily store oxygen for use in aerobic respiration.

Accepted Answer

A)   myoglobin
B)   acetylcholine
C)   creatine phosphate
D)   lactic acid
E)   pyruvic acidF) B) and C)
G) B) and D)

Question 11

Myofibrils are composed primarily of

Accepted Answer

A)   actin and myosin.
B)   ATP and ADP.
C)   troponin and tropomyosin.
D)   fascia and tendons.
E)   perimysium and endomysium.F) A) and D)
G) B) and D)

Question 12

Bundles of actin and myosin filaments form structures called ________.

Accepted Answer

A)   myofibrils
B)   sarcoplasm
C)   aponeuroses
D)   fascicles
E)   transverse tubulesF) A) and E)
G) None of the above

Question 13

The enzyme ATPase occurs in the globular portion of myosin molecules.

Accepted Answer

A) True 
 B)False

Question 14

In a recording of a muscle twitch,the delay between the time a stimulus is applied and the time the muscle responds is called the

Accepted Answer

A)   refractory period.
B)   relaxation period.
C)   latent period.
D)   contraction period.
E)   recovery period.F) B) and C)
G) B) and E)

Question 15

A motor neuron and the muscle fibers that it controls constitute a motor unit.

Accepted Answer

A) True 
 B)False

Question 16

A myofibril may be thought of as many of these joined end-to-end.

Accepted Answer

A)   sarcolemmas
B)   ribosomes
C)   sarcomeres
D)   muscle fibers
E)   Z linesF) None of the above
G) D) and E)

Question 17

The enlargement of muscle fibers as a result of exercise is called ________.

Accepted Answer

The answer of The enlargement of muscle fibers as a...

Question 18

Bundles of skeletal muscle fibers are called

Accepted Answer

A)   myofibrils.
B)   myofilaments.
C)   fascicles.
D)   myosin.
E)   sarcomeres.F) A) and E)
G) None of the above

Question 19

Neurons that control effectors are called

Accepted Answer

A)   aerobic neurons.
B)   sensory neurons.
C)   neurotransmitters.
D)   motor neurons.
E)   motor units.F) B) and E)
G) B) and D)

Question 20

The muscle primarily responsible for opposing a particular action is called the

Accepted Answer

A)   antagonist.
B)   prime mover.
C)   synergist.
D)   agonist.
E)   origin.F) A) and E)
G) A) and B)

Exam 8: Muscular System

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Correct AnswerverifiedShow Answer

Acetylcholinesterase decomposes the crossbridge linkages of myosin to actin.

Correct AnswerverifiedShow Answer

A myofibril may be thought of as many of these joined end-to-end.

Correct AnswerverifiedShow Answer

In a recording of a muscle twitch,the delay between the time a stimulus is applied and the time the muscle responds is called the

Correct AnswerverifiedShow Answer

Bundles of skeletal muscle fibers are called

Correct AnswerverifiedShow Answer

The muscle primarily responsible for opposing a particular action is called the

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This molecule,only present in muscle cells,is used to temporarily store oxygen for use in aerobic respiration.

Correct AnswerverifiedShow Answer

Myofibrils are composed primarily of

Correct AnswerverifiedShow Answer

The moveable end of a muscle is attached at its

Correct AnswerverifiedShow Answer

In this type of muscle cell,the sarcoplasmic reticulum is not well developed.

Correct AnswerverifiedShow Answer

The enlargement of muscle fibers as a result of exercise is called ________.

Correct AnswerverifiedShow Answer

Neurons that control effectors are called

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The enzyme ATPase occurs in the globular portion of myosin molecules.

Correct AnswerverifiedShow Answer

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Correct AnswerverifiedShow Answer

A motor neuron and the muscle fibers that it controls constitute a motor unit.

Correct AnswerverifiedShow Answer

The increase in the number of motor units activated as a result of more intense stimulation is called

Correct AnswerverifiedShow Answer

In the absence of oxygen,small amounts of ATP may be generated by this process.

Correct AnswerverifiedShow Answer

Bundles of actin and myosin filaments form structures called ________.

Correct AnswerverifiedShow Answer

When a muscle is stimulated repeatedly so that it cannot completely relax between contractions,_________ occurs.

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The zygomaticus muscle

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