Question 1

Which is a correct sequence of events in the onset of rigor mortis?

Accepted Answer

A)  Cellular membranes become leaky -> myosin heads bind to actin -> calcium ions leak into the sarcoplasm -> muscles are in a state of rigidity.
B)  Cellular membranes become leaky -> calcium ions leak into the sarcoplasm -> myosin heads bind to actin -> muscles are in a state of rigidity.
C)  Myosin heads bind to actin -> cellular membranes become leaky -> calcium ions leak into the sarcoplasm -> muscles are in a state of rigidity.
D)  Calcium ions leak into the sarcoplasm -> cellular membranes become leaky -> myosin heads bind to actin -> muscles are in a state of rigidity.
E)  Calcium ions leak into the sarcoplasm -> myosin heads bind to actin -> muscles are in a state of rigidity -> cellular membranes become leaky.

Question 2

List the four steps of the contraction cycle in order of occurrence.What is needed for these steps to continuously repeat?

Accepted Answer

The answer of List the four steps of the contraction...

Question 3

In the diagram,where would you find stored Ca2+?

Accepted Answer

A)  B
B)  D
C)  G
D)  F
E)  K

Question 4

Which of the following microscopic structures is only found in the cardiac muscle tissue?

Accepted Answer

A)  myosin
B)  tropomyosin
C)  sarcomeres
D)  intercalated discs
E)  striations

Question 5

How does a nerve impulse elicit a muscle action potential?

Accepted Answer

The answer of How does a nerve impulse elicit a...

Question 6

In the diagram,where is the axon terminal?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  E

Question 7

The contractile organelles of a skeletal muscle fiber are thread-like structures called

Accepted Answer

A)  myofibrils.
B)  myoglobin.
C)  mitochondria.
D)  Z discs.
E)  M lines.

Question 8

Smooth muscle tone is maintained by the prolonged presence of ______ in the muscle cell's cytosol?

Accepted Answer

A)  ATP
B)  calcium ions
C)  phosphate ions
D)  myoglobin
E)  None of these choices.

Question 9

This is the least powerful type of skeletal muscle fiber.

Accepted Answer

A)  slow oxidative fiber
B)  fast oxidative fiber
C)  fast glycolytic fiber
D)  slow glycolytic fiber
E)  None of these choices.

Question 10

Which of the labeled structures on the diagram holds muscles with similar functions together,allows free movement of muscles,carries nerves,blood vessels and lymphatic vessels,and fills spaces between muscles?

Accepted Answer

A)  A
B)  B
C)  E
D)  G
E)  H

Question 11

After prolonged strenuous exercise has stopped,heavy breathing will often continue for several minutes in order to provide the oxygen needed to

Accepted Answer

A)  convert the lactic acid produced during exercise back into glycogen.
B)  resynthesize creatine phosphate.
C)  replace oxygen displaced from muscle myoglobin.
D)  All of these choices
E)  None of these choices

Question 12

Biceps are predominantly composed of this type of muscle fiber.

Accepted Answer

A)  slow oxidative
B)  fast glycolytic
C)  fast oxidative-glycolytic
D)  slow glycolytic
E)  fast oxidative

Question 13

In the diagram,a bundle of muscle fibers form which structure?

Accepted Answer

A)  E
B)  F
C)  G
D)  H
E)  I

Question 14

After several visits to the gym and serious "iron pumping" (strength training) you notice that your biceps have enlarged.Which one of the following has happened to your muscles?

Accepted Answer

A)  atrophy
B)  dystrophy
C)  hyperplasia
D)  hypertrophy
E)  heterotrophy

Question 15

What regulatory proteins can be found in the thin filaments of skeletal muscle fibers?

Accepted Answer

A)  troponin and titin
B)  tropomyosin and troponin
C)  myosin and titin
D)  titin and tropomyosin
E)  tropomyosin and myosin

Question 16

A period of sustained skeletal muscle contraction in which individual twitches cannot be detected is called

Accepted Answer

A)  unfused tetanus.
B)  muscle atrophy.
C)  flaccidity.
D)  fused tetanus.
E)  wave summation.

Question 17

What are the three ways that ATP can be produced in muscle fibers?

Accepted Answer

The answer of What are the three ways that ATP...

Question 18

Which figure exhibits isometric contraction of the biceps brachii muscle?

Accepted Answer

A)  A
B)  B
C)  C
D)  none of these choices

Question 19

How much of the total body weight of an average adult is muscle tissue?

Accepted Answer

A)  20-30%
B)  30-40%
C)  40-50%
D)  50-60%
E)  60-70%

Question 20

The different types of muscle tissue differ from each other by

Accepted Answer

A)  microscopic anatomy.
B)  location.
C)  type of Control.
D)  both microscopic anatomy and location.
E)  All of these choices are correct.

Exam 10: Muscle Tissue

Which of the following microscopic structures is only found in the cardiac muscle tissue?

Correct AnswerverifiedShow Answer

In the diagram,where is the axon terminal?

Correct AnswerverifiedShow Answer

The different types of muscle tissue differ from each other by

Correct AnswerverifiedShow Answer

How does a nerve impulse elicit a muscle action potential?

Correct AnswerverifiedShow Answer

In the diagram,a bundle of muscle fibers form which structure?

Correct AnswerverifiedShow Answer

What regulatory proteins can be found in the thin filaments of skeletal muscle fibers?

Correct AnswerverifiedShow Answer

Smooth muscle tone is maintained by the prolonged presence of ______ in the muscle cell's cytosol?

Correct AnswerverifiedShow Answer

Which figure exhibits isometric contraction of the biceps brachii muscle?

Correct AnswerverifiedShow Answer

After several visits to the gym and serious "iron pumping" (strength training) you notice that your biceps have enlarged.Which one of the following has happened to your muscles?

Correct AnswerverifiedShow Answer

Biceps are predominantly composed of this type of muscle fiber.

Correct AnswerverifiedShow Answer

This is the least powerful type of skeletal muscle fiber.

Correct AnswerverifiedShow Answer

List the four steps of the contraction cycle in order of occurrence.What is needed for these steps to continuously repeat?

Correct AnswerverifiedShow Answer

A period of sustained skeletal muscle contraction in which individual twitches cannot be detected is called

Correct AnswerverifiedShow Answer

Which is a correct sequence of events in the onset of rigor mortis?

Correct AnswerverifiedShow Answer

Which of the labeled structures on the diagram holds muscles with similar functions together,allows free movement of muscles,carries nerves,blood vessels and lymphatic vessels,and fills spaces between muscles?

Correct AnswerverifiedShow Answer

In the diagram,where would you find stored Ca2+?

Correct AnswerverifiedShow Answer

After prolonged strenuous exercise has stopped,heavy breathing will often continue for several minutes in order to provide the oxygen needed to

Correct AnswerverifiedShow Answer

The contractile organelles of a skeletal muscle fiber are thread-like structures called

Correct AnswerverifiedShow Answer

What are the three ways that ATP can be produced in muscle fibers?

Correct AnswerverifiedShow Answer

How much of the total body weight of an average adult is muscle tissue?

Correct AnswerverifiedShow Answer

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