Question 1

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 C)
G) B) and D)

Question 2

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) A) and E)
G) B) and C)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Loss of muscle mass from lack of activity is called __________.

Accepted Answer

A)  myopathy
B)  dystrophy
C)  apathy
D)  atrophy
E)  tetanusF) B) and E)
G) C) and E)

Question 5

Why does one continue to breathe heavy after rigorous physical activity has stopped?

Accepted Answer

A)  The diaphragm is waiting for its acetylcholine to run out.
B)  The body requires more oxygen to restore levels of ATP and creatine phosphate.
C)  The lungs can't stop breathing until the heart rate slows down.
D)  Myosin heads need more oxygen to fully detach from actin.
E)  The kidneys require oxygen to dispose of excess lactic acid.F) None of the above
G) C) and D)

Question 6

Some smooth muscle is autorhythmic.

Accepted Answer

A) True 
 B)False

Question 7

In skeletal muscle,the term that describes the alternating light and dark bands is ___________.

Accepted Answer

A)  strabismus
B)  striations
C)  tetanus
D)  myofibrils
E)  myoblastsF) D) and E)
G) B) and D)

Question 8

Skeletal muscle is called ___________,because it is usually subject to conscious control.

Accepted Answer

A)  excitable
B)  contractile
C)  striated
D)  voluntary
E)  isometricF) A) and B)
G) All of the above D

Question 9

Which of the following is a property of collagen?

Accepted Answer

A)  Contractility
B)  Excitability
C)  Elasticity
D)  Expendability
E)  ImpermeabilityF) All of the above
G) A) and B)

Question 10

Which of the following is predominately made up of myosin?

Accepted Answer

A)  G actin
B)  F actin
C)  The thin filament
D)  The thick filament
E)  The elastic filamentF) A) and B)
G) A) and E)

Question 11

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 12

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

Accepted Answer

A)  They link the thin filaments to the inside of the sarcolemma in smooth muscle.
B)  They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down.
C)  They enable each cardiac myocyte to directly stimulate its neighbors.
D)  They release neurotransmitter onto smooth muscle cells.
E)  They prevent single-unit smooth muscle cells from pulling apart.F) C) and D)
G) A) and B)

Question 13

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) B) and C)
G) C) and D)

Question 14

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch,the most likely result will be __________.

Accepted Answer

A)  fatigue
B)  spasm
C)  incomplete tetanus
D)  complete tetanus
E)  flaccid paralysisF) A) and D)
G) B) and D) C

Question 15

In order for muscle to continue contracting during anaerobic fermentation,which of the following is essential?

Accepted Answer

A)  Cholinesterase inhibitors
B)  Protease
C)  Myokinase
D)  Acetylcholinesterase
E)  Acid phosphataseF) A) and C)
G) B) and E) C

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 soccer player
C)  A long-term hospice patient
D)  A model on a reduced-calorie diet
E)  A newbornF) C) and D)
G) B) and D)

Question 17

Which of the following best describes the resting membrane potential (RMP) ?

Accepted Answer

A)  The intracellular environment is negatively charged.
B)  The intracellular environment has more positively charged sodium.
C)  The extracellular environment is negatively charged.
D)  It has a voltage of about +75 mV.
E)  It is dependent upon the absorption of potassium ions by the muscle fiber.F) B) and E)
G) B) and C)

Question 18

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 lactic acid
D)  To serve elevated metabolic rate
E)  To restore resting levels of ATP and CPF) C) and E)
G) B) and E)

Question 19

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 E)
G) B) and E)

Question 20

What is the purpose of the triad?

Accepted Answer

A)  The triad stores sodium.
B)  The triad synthesizes ATP.
C)  The triad maintains the resting membrane potential.
D)  The triad removes acetylcholine from the synaptic cleft.
E)  The triad allows for Ca2+ release when a muscle fiber is excited.F) A) and B)
G) C) and D)

Exam 11: Muscular Tissue

Which of the following has the largest mitochondria?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Loss of muscle mass from lack of activity is called __________.

Correct AnswerverifiedShow Answer

Why does one continue to breathe heavy after rigorous physical activity has stopped?

Correct AnswerverifiedShow Answer

Some smooth muscle is autorhythmic.

Correct AnswerverifiedShow Answer

In skeletal muscle,the term that describes the alternating light and dark bands is ___________.

Correct AnswerverifiedShow Answer

Skeletal muscle is called ___________,because it is usually subject to conscious control.

Correct AnswerverifiedD

Which of the following is a property of collagen?

Correct AnswerverifiedShow Answer

Which of the following is predominately made up of myosin?

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

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

Correct AnswerverifiedShow Answer

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

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch,the most likely result will be __________.

Correct AnswerverifiedC

In order for muscle to continue contracting during anaerobic fermentation,which of the following is essential?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Which of the following best describes the resting membrane potential (RMP) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the purpose of the triad?

Correct AnswerverifiedShow Answer

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D

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C

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C

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