Question 1

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 E)
G) A) and D)

Question 2

When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles,the skeletal muscle __________.

Accepted Answer

A)   contracts
B)   gets stronger
C)   relaxes
D)   releases Ca2+
E)   opens its Na+ channelsF) B) and E)
G) A) and D)

Question 3

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) All of the above
G) B) and D)

Question 4

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 D)
G) A) and B)

Question 5

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

Question 6

Which of the following has the largest mitochondria?

Accepted Answer

A)   Slow oxidative fibers
B)   Fast glycolytic fibers
C)   Cardiac muscle
D)   Smooth muscle
E)   Intermediate fibersF) B) and D)
G) C) and D)

Question 7

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) A) and B)
G) B) and E) D

Question 8

A volleyball player depends on the gastrocnemius muscles for plantar flexion,whereas a marathon runner depends more on the soleus muscles for the same action.What characteristic of the soleus muscles makes this so?

Accepted Answer

A)   They have smaller mitochondria.
B)   They have more glycogen in them.
C)   They don't have as many blood capillaries per gram of tissue.
D)   They make more use of aerobic respiration.
E)   They break ATP down to ADP and Pi faster.F) A) and D)
G) B) and C)

Question 9

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

Accepted Answer

A)   Skeletal muscle
B)   Smooth muscle
C)   Cardiac muscle
D)   Skeletal and smooth muscle
E)   Smooth and cardiac muscleF) A) and D)
G) C) and E) A

Question 10

If one nerve stimulus arrives at a muscle fiber so soon that the fiber does NOT relax at all from the previous twitch,the most likely result will be __________.This can only be achieved in the laboratory.

Accepted Answer

A)   fatigue
B)   spasm
C)   incomplete tetanus
D)   complete tetanus
E)   wave summationF) A) and B)
G) All of the above

Question 11

Why is the contraction strength of smooth muscle relatively independent of its resting length?

Accepted Answer

A)   It gets nearly all of its Ca2+ from the extracellular fluid.
B)   It does not have intercalated discs.
C)   It does not have sarcomeres.
D)   It is regulated by a length-tension relationship.
E)   It is involuntary muscle.F) A) and B)
G) None of the above

Question 12

Which of the following would be caused by a contraction of smooth muscle?

Accepted Answer

A)   Goose bumps
B)   Blood leaving the left ventricle of the heart
C)   Elevating the eyebrows
D)   Blinking the eyelids
E)   Deep inspirationF) A) and B)
G) B) and E)

Question 13

Skeletal muscle are attached to bones in a way that aligns proteins in an overly-stretch (lengthened)position.This lengthening facilitates the shortening of contractions.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not a purpose of the excess postexercise oxygen consumption (EPOC) in muscle?

Accepted Answer

A)   To neutralize carbon dioxide buildup
B)   To replenish the phosphagen system
C)   To oxidize lactate
D)   To serve elevated metabolic rate
E)   To restore resting levels of ATP and CPF) A) and C)
G) C) and D)

Question 15

Extensibility refers to the ability of a muscle to stretch.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A)   Plasticity
B)   Contractility
C)   Conductivity
D)   Extensibility
E)   ExcitabilityF) None of the above
G) B) and C)

Question 17

The minimum stimulus needed to cause muscle contraction is called the __________.

Accepted Answer

A)   threshold
B)   latent period
C)   twitch
D)   motor unit
E)   innervationF) None of the above
G) C) and D)

Question 18

The triads of a muscle fiber consist of __________.

Accepted Answer

A)   two A bands and one I band
B)   two T tubules and one terminal cistern
C)   two terminal cisterns and one T tubule
D)   two thin myofilaments and one thick myofilament
E)   two thick myofilaments and one thin myofilamentF) A) and B)
G) A) and C) C

Question 19

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) C) and D)
G) D) and E)

Question 20

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) D) and E)
G) A) and B)

Exam 11: Muscular Tissue

Which of the following is true concerning isotonic eccentric contraction?

Correct AnswerverifiedShow Answer

When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles,the skeletal muscle __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 has the largest mitochondria?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

A volleyball player depends on the gastrocnemius muscles for plantar flexion,whereas a marathon runner depends more on the soleus muscles for the same action.What characteristic of the soleus muscles makes this so?

Correct AnswerverifiedShow Answer

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

Correct AnswerverifiedA

If one nerve stimulus arrives at a muscle fiber so soon that the fiber does NOT relax at all from the previous twitch,the most likely result will be __________.This can only be achieved in the laboratory.

Correct AnswerverifiedShow Answer

Why is the contraction strength of smooth muscle relatively independent of its resting length?

Correct AnswerverifiedShow Answer

Which of the following would be caused by a contraction of smooth muscle?

Correct AnswerverifiedShow Answer

Skeletal muscle are attached to bones in a way that aligns proteins in an overly-stretch (lengthened)position.This lengthening facilitates the shortening of contractions.

Correct AnswerverifiedShow Answer

Which of the following is not a purpose of the excess postexercise oxygen consumption (EPOC) in muscle?

Correct AnswerverifiedShow Answer

Extensibility refers to the ability of a muscle to stretch.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The minimum stimulus needed to cause muscle contraction is called the __________.

Correct AnswerverifiedShow Answer

The triads of a muscle fiber consist of __________.

Correct AnswerverifiedC

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

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

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D

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A

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C

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