Question 1

A runner collapses during a race and is examined by a doctor. They have lost the ability to plantar flex at the ankle. Which of the following is probably the injured muscle?

Accepted Answer

A)  Gastrocnemius
B)  Biceps femoris
C)  Semimembranosus
D)  Tibialis anteriorE) A) and D)
F) All of the above

Question 2

Rigor mortis affects skeletal muscles a few hours after death, due to

Accepted Answer

A)  an increase in ATP and decreased permeability to calcium.
B)  a decrease in ATP and increased permeability to calcium.
C)  an increase in ATP.
D)  impulses that produce sustained contractions.E) None of the above
F) A) and C)

Question 3

Muscle fibers generally only have one motor end plate, but motor neurons innervate many different muscle fibers in a group. Choose the statement that correctly explains how this affects muscle contraction.

Accepted Answer

A)  While muscle fibers only have one motor end plate, they can recruit each other to contract once a fiber receives a signal.
B)  When a motor neuron transmits a signal, only one fiber will contract with strong force.
C)  A signal traveling through one motor neuron can potentially make multiple fibers in a group contract, generating more force.
D)  The force of a contraction does not at all depend on the strength of the signal sent via the motor neuron.E) None of the above
F) A) and B)

Question 4

At a neuromuscular junction, the muscle fiber membrane folds, forming a

Accepted Answer

A)  motor neuron.
B)  neurotransmitter.
C)  motor unit.
D)  motor end plate.E) B) and D)
F) B) and C)

Question 5

Cardiac muscle

Accepted Answer

A)  is multinucleated.
B)  excites itself.
C)  contains only a few mitochondria.
D)  partially lines the intestines.E) A) and B)
F) A) and C)

Question 6

A group of rats are bred in a laboratory to study muscle function. This group possesses a genetic defect that causes the myosin heads to bind ADP irreversibly. The rats are entirely paralyzed. Which of the following correctly explains the impact of the defect on the muscle?

Accepted Answer

A)  ATP won't bind to the myosin heads, preventing the actin binding site of the thick filament from being revealed.
B)  Because ADP is permanently bound, the myosin heads can never bind to the actin binding sites of the thin filament.
C)  Because ADP is permanently bound, the myosin heads will be irreversibly cross-bridged with the actin binding sites of the thin filament.
D)  ATP won't bind to the myosin heads, causing the thin filament to be constantly pulled in the power stroke of contraction.E) None of the above
F) A) and B)

Question 7

Tawanda finishes a sprint and suffers great pain in her calf muscles. Her muscle cramps are most likely due to a temporary deficit of

Accepted Answer

A)  actin.
B)  myosin.
C)  ATP.
D)  ADP.E) B) and D)
F) A) and B)

Question 8

The rhythmic, wavelike motion produced by smooth muscles in tubular visceral organs is called ________.

Accepted Answer

The answer of The rhythmic, wavelike motion produced by smooth...

Question 9

A sign of aging of the muscular system is

Accepted Answer

A)  expansion of muscle fiber diameters.
B)  decreased supplies of myoglobin.
C)  excess ATP.
D)  increased creatine phosphate.E) A) and B)
F) All of the above

Question 10

The discoloration and swelling that occurs with a muscle strain is due to

Accepted Answer

A)  excess myofibrils.
B)  separated tendons.
C)  severed nerves.
D)  ruptured blood vessels.E) All of the above
F) C) and D)

Question 11

The soleus is a muscle that forms part of the

Accepted Answer

A)  calf.
B)  buttocks.
C)  thigh.
D)  shoulder.E) A) and B)
F) A) and C)

Question 12

Functions of muscles include

Accepted Answer

A)  pumping blood.
B)  generating electrical impulses.
C)  storage of minerals.
D)  cushioning tissues from blunt force.E) None of the above
F) A) and B)

Question 13

The muscle that adducts and flexes the arm is the

Accepted Answer

A)  coracobrachialis.
B)  pectoralis minor.
C)  levator scapulae.
D)  teres major.E) B) and D)
F) All of the above

Question 14

The triangle of auscultation, commonly used to hear sounds of respiratory organs, is located near the border of the

Accepted Answer

A)  pectoralis major and pectoralis minor.
B)  trapezius and latissimus dorsi.
C)  latissimus dorsi and serratus anterior.
D)  pectoralis major and serratus anterior.E) B) and D)
F) A) and C)

Question 15

The muscle that opposes a particular action is called the

Accepted Answer

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

Question 16

Activities such as distance swimming and distance running will most likely stimulate development of

Accepted Answer

A)  slow fatigable muscle fibers.
B)  fast fatigable muscle fibers.
C)  slow fatigue-resistant fibers.
D)  fast fatigue-resistant fibers.E) A) and B)
F) A) and C)

Question 17

The muscle that covers the upper part of the cranium is the ________.

Accepted Answer

The answer of The muscle that covers the upper part...

Question 18

Which of the following is not a muscle of mastication?

Accepted Answer

A)  Medial and lateral pterygoid
B)  Masseter
C)  Temporalis
D)  ZygomaticusE) B) and C)
F) A) and D)

Question 19

Endomysium separates individual muscle fibers from each other.

Accepted Answer

A) True 
 B)False

Question 20

The functional connection between a neuron and a skeletal muscle fiber is a

Accepted Answer

A)  synapse.
B)  fascia.
C)  neuroma.
D)  dendrite.E) A) and D)
F) B) and D)

Exam 9: Muscular System

Which of the following is not a muscle of mastication?

Correct AnswerverifiedShow Answer

Tawanda finishes a sprint and suffers great pain in her calf muscles. Her muscle cramps are most likely due to a temporary deficit of

Correct AnswerverifiedShow Answer

Cardiac muscle

Correct AnswerverifiedShow Answer

Muscle fibers generally only have one motor end plate, but motor neurons innervate many different muscle fibers in a group. Choose the statement that correctly explains how this affects muscle contraction.

Correct AnswerverifiedShow Answer

The discoloration and swelling that occurs with a muscle strain is due to

Correct AnswerverifiedShow Answer

A group of rats are bred in a laboratory to study muscle function. This group possesses a genetic defect that causes the myosin heads to bind ADP irreversibly. The rats are entirely paralyzed. Which of the following correctly explains the impact of the defect on the muscle?

Correct AnswerverifiedShow Answer

A runner collapses during a race and is examined by a doctor. They have lost the ability to plantar flex at the ankle. Which of the following is probably the injured muscle?

Correct AnswerverifiedShow Answer

A sign of aging of the muscular system is

Correct AnswerverifiedShow Answer

The muscle that covers the upper part of the cranium is the ________.

Correct AnswerverifiedShow Answer

The soleus is a muscle that forms part of the

Correct AnswerverifiedShow Answer

The functional connection between a neuron and a skeletal muscle fiber is a

Correct AnswerverifiedShow Answer

The muscle that opposes a particular action is called the

Correct AnswerverifiedShow Answer

At a neuromuscular junction, the muscle fiber membrane folds, forming a

Correct AnswerverifiedShow Answer

Activities such as distance swimming and distance running will most likely stimulate development of

Correct AnswerverifiedShow Answer

Rigor mortis affects skeletal muscles a few hours after death, due to

Correct AnswerverifiedShow Answer

The triangle of auscultation, commonly used to hear sounds of respiratory organs, is located near the border of the

Correct AnswerverifiedShow Answer

The muscle that adducts and flexes the arm is the

Correct AnswerverifiedShow Answer

Functions of muscles include

Correct AnswerverifiedShow Answer

The rhythmic, wavelike motion produced by smooth muscles in tubular visceral organs is called ________.

Correct AnswerverifiedShow Answer

Endomysium separates individual muscle fibers from each other.

Correct AnswerverifiedShow Answer

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