Question 1

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.This is because the soleus muscles

Accepted Answer

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

Question 2

Which of the following would be caused by 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 D)
G) A) and C)

Question 3

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 cisterna.
C)  two terminal cisternae and one T tubule.
D)  two thin myofilaments and one thick myofilament.
E)  two thick myofilaments and one thin myofilament.F) A) and C)
G) C) and D)

Question 4

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

Accepted Answer

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

Question 5

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 mode.F) A) and D)
G) B) and D)

Question 6

The sliding filament theory of muscle contraction has emerged from research only in the last 10 to 15
years.

Accepted Answer

A) True 
 B)False

Question 7

A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.

Accepted Answer

A) True 
 B)False

Question 8

Which band contains overlapping thick and thin filaments?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) A) and C)
G) B) and E)

Question 9

The sarcoplasmic reticulum is the smooth endoplasmic reticulum of a muscle fiber.

Accepted Answer

A) True 
 B)False  True

Question 10

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate.These drugs

Accepted Answer

A)  prevent calcium from entering the sarcoplasmic reticulum of smooth muscle.
B)  stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.
C)  prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle.
D)  prevent calcium from entering cardiac muscle, thus slowing down the heart rate.
E)  prevent calcium from entering smooth muscle, thus allowing the muscle to relax.F) B) and D)
G) B) and E) E

Question 11

The term for shortening of a muscle while maintaining constant tension is

Accepted Answer

A)  treppe.
B)  tetanus.
C)  isokinetic contraction.
D)  isometric contraction.
E)  isotonic contraction.F) D) and E)
G) None of the above

Question 12

During muscle contraction, a single myosin head consumes ATP at a rate of about

Accepted Answer

A)  1 ATP per second.
B)  3 ATP per second.
C)  5 ATP per second.
D)  7 ATP per second.
E)  9 ATP per second.F) C) and E)
G) B) and E)

Question 13

The process of bringing more motor units into use during a muscle contraction is called

Accepted Answer

A)  wave summation.
B)  recruitment.
C)  treppe.
D)  incomplete tetanus.
E)  complete tetanus.F) All of the above
G) B) and C) B

Question 14

In skeletal muscle, alternating light and dark bands are termed

Accepted Answer

A)  strabismus.
B)  striations.
C)  treppe.
D)  myofibrils.
E)  myoblasts.F) B) and E)
G) A) and E)

Question 15

A myofilament that flanks a thick filament and anchors it to a Z disc is called

Accepted Answer

A)  a myofibril.
B)  a thin filament.
C)  a myoglobin.
D)  a sarcoplasm.
E)  an elastic filament.F) A) and E)
G) A) and B)

Question 16

Which of the following individuals would have more mitochondria in her skeletal muscle?

Accepted Answer

A)  a 50-year-old sedentary computer programmer
B)  a 22-year-old football player
C)  a long-term hospice patient
D)  a model on a reduced-calorie diet
E)  a newbornF) A) and D)
G) B) and E)

Question 17

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 C)
G) B) and D)

Question 18

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 C)
G) A) and D)

Question 19

Collagen is

Accepted Answer

A)  contractile.
B)  excitable.
C)  elastic.
D)  expendable.
E)  impermeable.F) B) and C)
G) A) and C)

Question 20

Michael Jordan was arguably the best player in professional basketball history.Scientifically one would expect him to have highly developed

Accepted Answer

A)  red fibers.
B)  white fibers.
C)  intermediate fibers.
D)  fast-twitch fibers.
E)  slow oxidative fibers.F) A) and D)
G) A) and C)

Exam 11: Muscular Tissue

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.This is because the soleus muscles

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The triads of a muscle fiber consist of

Correct AnswerverifiedShow Answer

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

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

The sliding filament theory of muscle contraction has emerged from research only in the last 10 to 15 years.

Correct AnswerverifiedShow Answer

A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.

Correct AnswerverifiedShow Answer

Which band contains overlapping thick and thin filaments?

Correct AnswerverifiedShow Answer

The sarcoplasmic reticulum is the smooth endoplasmic reticulum of a muscle fiber.

Correct AnswerverifiedTrue

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate.These drugs

Correct AnswerverifiedE

The term for shortening of a muscle while maintaining constant tension is

Correct AnswerverifiedShow Answer

During muscle contraction, a single myosin head consumes ATP at a rate of about

Correct AnswerverifiedShow Answer

The process of bringing more motor units into use during a muscle contraction is called

Correct AnswerverifiedB

In skeletal muscle, alternating light and dark bands are termed

Correct AnswerverifiedShow Answer

A myofilament that flanks a thick filament and anchors it to a Z disc is called

Correct AnswerverifiedShow Answer

Which of the following individuals would have more mitochondria in her skeletal muscle?

Correct AnswerverifiedShow Answer

Which of the following is true concerning isotonic eccentric contraction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Collagen is

Correct AnswerverifiedShow Answer

Michael Jordan was arguably the best player in professional basketball history.Scientifically one would expect him to have highly developed

Correct AnswerverifiedShow Answer

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True

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E

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B

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