Question 1

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Accepted Answer

A) True 
 B)False

Question 2

Intercalated discs are found in skeletal muscle and cardiac muscle, but are not present in smooth muscle.

Accepted Answer

A) True 
 B)False

Question 3

In the absence of oxygen, what process is used by muscle cells to generate small amounts of ATP?

Accepted Answer

A)   Electron transport chain
B)   Glycolysis
C)   Aerobic respiration
D)   Hydrolysis of myoglobinE) A) and B)
F) All of the above

Question 4

For the biceps brachii, triceps brachii, and the quadriceps femoris, what is referred to by the prefixes "bi-", "tri-", and "quad-"?

Accepted Answer

A)   The number of heads (origins) 
B)   The number of bones that are moved when the muscle contracts
C)   The number of insertions
D)   The number of aponeuroses bundling the muscles togetherE) None of the above
F) A) and B)

Question 5

What 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) None of the above
G) A) and E)

Question 6

Layers of dense connective tissue called __________ separate and support individual muscles.

Accepted Answer

A)   fascia
B)   tendons
C)   cartilage
D)   aponeurosesE) None of the above
F) B) and C)

Question 7

A(n)  __________ is a single contraction of a muscle fiber in response to a single stimulus.

Accepted Answer

A)   sustained contraction
B)   threshold stimulus
C)   twitch
D)   cramp
E)   all-or-none responseF) A) and C)
G) C) and D)

Question 8

What binds to actin at its binding sites, allowing the formation of cross-bridges?

Accepted Answer

A)   ATP
B)   Myosin
C)   Troponin
D)   Tropomyosin
E)   CreatineF) D) and E)
G) A) and B)

Question 9

In skeletal muscle fibers, what is the source of the calcium ions that are released into the sarcoplasm to bind with troponin, resulting in contraction?

Accepted Answer

A)   Extracellular fluid
B)   Sarcoplasmic reticulum
C)   Mitochondria
D)   Golgi apparatusE) C) and D)
F) None of the above

Question 10

What type of muscle fiber is large in diameter and contains abundant glycogen and relatively few mitochondria?

Accepted Answer

A)   Fast fibers
B)   Slow fibersC) A) and B)
D) undefined

Question 11

Where would an antagonist to the sternocleidomastoidmuscles be located?

Accepted Answer

A)   On the posterior side of the body
B)   On the anterior side of the body
C)   Inferior to the clavicleD) A) and C)
E) B) and C)

Question 12

In skeletal muscle cells, what molecule can be used to transfer energy to ADP in order to form ATP?

Accepted Answer

A)   Acetylcholine
B)   Troponin
C)   Actin
D)   Creatinephosphate
E)   GlucoseF) A) and B)
G) B) and D)

Question 13

What type of neurons function to control effectors?

Accepted Answer

A)   Aerobic neurons
B)   Sensory neurons
C)   Axon terminals
D)   Motor neurons
E)   Motor unitsF) B) and E)
G) A) and E)

Question 14

What is muscle atrophy?

Accepted Answer

A)   Decrease in size and strength
B)   Increase in number of muscle fibers
C)   Increase in size of muscle fibers
D)   Decrease in length of muscle fibersE) A) and B)
F) All of the above

Question 15

What is an action of the rectus femoris muscle?

Accepted Answer

A)   Extends leg at knee
B)   Plantar flexes the foot
C)   Extends the thigh at the hip
D)   Adducts the thighE) A) and B)
F) A) and C)

Question 16

During anaerobic respiration, pyruvic acidmolecules are converted into molecules of ____________.

Accepted Answer

The answer of During anaerobic respiration, pyruvic acidmolecules are converted...

Question 17

Endomysium separates individual muscle fibers from each other.

Accepted Answer

A) True 
 B)False

Question 18

The rhythmic, wavelike motion produced by visceral smooth muscle is called __________.

Accepted Answer

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

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Consider a muscle that originates on the anterior forearm and inserts on the palm of the hand. What is the action of this muscle?

Accepted Answer

A)   To flex the wrist
B)   To flex the elbow
C)   To extend the wrist
D)   To extend the elbowE) B) and C)
F) A) and D)

Exam 8: Muscular System

A(n) __________ is a single contraction of a muscle fiber in response to a single stimulus.

Correct AnswerverifiedShow Answer

What type of muscle fiber is large in diameter and contains abundant glycogen and relatively few mitochondria?

Correct AnswerverifiedShow Answer

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

For the biceps brachii, triceps brachii, and the quadriceps femoris, what is referred to by the prefixes "bi-", "tri-", and "quad-"?

Correct AnswerverifiedShow Answer

In skeletal muscle cells, what molecule can be used to transfer energy to ADP in order to form ATP?

Correct AnswerverifiedShow Answer

In skeletal muscle fibers, what is the source of the calcium ions that are released into the sarcoplasm to bind with troponin, resulting in contraction?

Correct AnswerverifiedShow Answer

Intercalated discs are found in skeletal muscle and cardiac muscle, but are not present in smooth muscle.

Correct AnswerverifiedShow Answer

Consider a muscle that originates on the anterior forearm and inserts on the palm of the hand. What is the action of this muscle?

Correct AnswerverifiedShow Answer

During anaerobic respiration, pyruvic acidmolecules are converted into molecules of ____________.

Correct AnswerverifiedShow Answer

What is muscle atrophy?

Correct AnswerverifiedShow Answer

Endomysium separates individual muscle fibers from each other.

Correct AnswerverifiedShow Answer

In the absence of oxygen, what process is used by muscle cells to generate small amounts of ATP?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The rhythmic, wavelike motion produced by visceral smooth muscle is called __________.

Correct AnswerverifiedShow Answer

What is an action of the rectus femoris muscle?

Correct AnswerverifiedShow Answer

Layers of dense connective tissue called __________ separate and support individual muscles.

Correct AnswerverifiedShow Answer

What binds to actin at its binding sites, allowing the formation of cross-bridges?

Correct AnswerverifiedShow Answer

What type of neurons function to control effectors?

Correct AnswerverifiedShow Answer

Where would an antagonist to the sternocleidomastoidmuscles be located?

Correct AnswerverifiedShow Answer

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