Question 1

Which of these is not part of the axial skeleton?

Accepted Answer

A)  skull
B)  backbone
C)  rib cage
D)  pelvisE) A) and B)
F) All of the above

Question 2

According to the figure,which one represents the muscle in an optimal condition for contraction?

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) A) and B)
F) None of the above

Question 3

_________ is a sustained muscle contraction.

Accepted Answer

A)  Tetanus
B)  A fast-twitch
C)  Tension
D)  A slow-twitchE) C) and D)
F) B) and D)

Question 4

The repeating units of myofibrils are made from contractile subunits called sarcomeres.Which of these is not part of the sarcomere's structure?

Accepted Answer

A)  A band
B)  Z line
C)  I band
D)  H band
E)  C lineF) B) and E)
G) B) and D)

Question 5

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Accepted Answer

A)  troponin
B)  tropomyosin
C)  actin
D)  myosinE) B) and C)
F) All of the above

Question 6

The muscle fiber contracts by a sequence of events initiated by the acetylcholine.Which of the following is the correct sequence?
I-The calcium-troponin complex pulls away tropomyosin from the myosin binding sites of actin.
II-The freed-sites of actin now can bind to myosin to form cross bridges.
III-Calcium ion binds to the troponin.

Accepted Answer

A)  I,III,and II
B)  III,II,and I
C)  II,III,and I
D)  I,II,and III
E)  III,I,and IIF) B) and E)
G) A) and E)

Question 7

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Accepted Answer

A)  H line.
B)  I line.
C)  I zone.
D)  Z line.
E)  Z framE.F) C) and E)
G) All of the above

Question 8

Succinylcholine chloride,a depolarizing acetylcholine agonist,was lethally injected into the circulatory system of a bear.What effect would this have?

Accepted Answer

A)  The bear would collapse and convulse to death.
B)  The skeletal muscles would contract,then become paralyzed.
C)  The skeletal muscles would become paralyzed.
D)  The bear would have a heart attack.E) A) and B)
F) A) and C)

Question 9

The use-dependent decrease in the ability of a muscle to generate force is called ______.

Accepted Answer

A)  tetanus
B)  aerobic fitness
C)  fatigue
D)  enduranceE) B) and D)
F) A) and B)

Question 10

Which of the following panels best represents the power stroke?

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) A) and C)
F) B) and C)

Question 11

Insects such as mosquitoes and beetles can beat their wings at tremendous speeds.This can be accomplished because

Accepted Answer

A)  their wing muscle contractions causes another set of muscles to stretch which in turn produces another contraction without waiting for the arrival of a nerve impulse.
B)  their wing muscle contractions cause another set of muscles to relax which in turn produces another wing movement.
C)  their wing muscle contractions are stimulated by the continuous nerve signal impulses which produce a continuous contraction of their wing muscles.
D)  their wing muscle contractions are capable of producing more ATP which allows these insects to have much faster and sustained wing movements.
E)  their wing muscle contractions produce nerve impulses which lead to more contraction of the wing muscles which in turn permits faster motion of the wings.F) C) and D)
G) A) and E)

Question 12

Select the incorrect statement about muscle fibers.

Accepted Answer

A)  A quick contraction and relaxation of an isolated skeletal muscle is called tetanus.
B)  Slow-twitch muscle fibers,for example the soleus muscle of the leg,require about 100 milliseconds to reach maximum tension.
C)  Slow-twitch muscle fibers have high concentrations of myoglobin.
D)  Fast-twitch fibers,for example the muscles of the human eye,reach maximum tensions in 7.3 milliseconds.
E)  Fast-twitch fibers have fewer capillaries and mitochondria than slow-twitch fibers.F) B) and E)
G) A) and B)

Question 13

The myofibrils consist of both thin filaments made of actin proteins,and thick filaments composed of

Accepted Answer

A)  myosin proteins.
B)  contractile protein subunits.
C)  Z line proteins.
D)  sarcoplasmic proteins.
E)  isometric proteins.F) B) and E)
G) B) and C)

Question 14

Which of the developmental schemes for bone is not possible?

Accepted Answer

A)  undifferentiated Mesenchymal cells,osteocyte,osteoblast
B)  undifferentiated Mesenchymal cells,fibroblast,collagen
C)  undifferentiated Mesenchymal cells,chondroblast,chondrocyte
D)  osteoblasts,osteocyte,osteoclast
E)  undifferentiated Mesenchymal cells,osteoblast,osteocyteF) B) and D)
G) A) and C)

Question 15

Earthworms use their hydrostatic skeletons to move through the soil.As earthworms move through the soil they

Accepted Answer

A)  contract their circular muscles,which press their longitudinal muscles,which in turn stretch to elongate the segments of their bodies.
B)  contract their longitudinal muscles,which press their circular muscles,which in turn stretch to elongate the segments of their bodies.
C)  contract their circular muscles,which stretch their longitudinal muscles,which in turn stretch to enlarge the segments of their bodies.
D)  contract their circular muscles,which press their clitellum and attached setae into the burrow;with the setae as anchors,the earthworms are able to pull their bodies through the soil.
E)  contract their longitudinal muscles,which compress their circular muscles,which in turn reduce each segment's circumference allowing forward movement.F) A) and B)
G) A) and C)

Question 16

Which of the following joint types is not correctly matched with its example?

Accepted Answer

A)  ball-and-socket joint-femur and pelvis
B)  gliding joint-vertebral column
C)  immovable joint-skull sutures
D)  hinge joint-finger joint
E)  combination joint-knee jointF) C) and D)
G) A) and E)

Question 17

How would you compare the onset of rigor mortis with a frog versus a rat?

Accepted Answer

A)  A rat would enter rigor mortis significantly faster than a frog upon death.
B)  A frog would enter rigor mortis significantly faster than a rat upon death.
C)  The frog and rat would enter rigor mortis at the same time regardless of the external environment as long as the time of death was the same.
D)  The frog would enter rigor mortis at the same time as the rat if they died at the same time and the frog was at 37 ∘\circ∘ C. E) None of the above
F) A) and B)

Question 18

Sustained contraction is called

Accepted Answer

A)  twitching.
B)  summation.
C)  tetanus.
D)  recruitment.
E)  isometric binding.F) A) and B)
G) B) and C)

Question 19

The interaction between __________ can be described as the forming of cross-bridges.

Accepted Answer

A)  actin and myosin
B)  troponin and tropomyosin
C)  Ca2+ and troponin
D)  myosin and tropomyosinE) None of the above
F) B) and D)

Question 20

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Accepted Answer

A)  from the sarcoplasmic reticulum.
B)  from the actin and myosin subunits.
C)  from the Z line.
D)  from the stimulated muscle fibers.
E)  from the troponin.F) B) and E)
G) A) and C)

Exam 47: The Musculoskeletal System

The repeating units of myofibrils are made from contractile subunits called sarcomeres.Which of these is not part of the sarcomere's structure?

Correct Answer
verified

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Correct Answer
verified

How would you compare the onset of rigor mortis with a frog versus a rat?

Correct Answer
verified

Correct Answer
verified

The myofibrils consist of both thin filaments made of actin proteins,and thick filaments composed of

Correct Answer
verified

Which of the developmental schemes for bone is not possible?

Correct Answer
verified

According to the figure,which one represents the muscle in an optimal condition for contraction?

Correct Answer
verified

Which of the following panels best represents the power stroke?

Correct Answer
verified

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Correct Answer
verified

Succinylcholine chloride,a depolarizing acetylcholine agonist,was lethally injected into the circulatory system of a bear.What effect would this have?

Correct Answer
verified

_________ is a sustained muscle contraction.

Correct Answer
verified

The interaction between __________ can be described as the forming of cross-bridges.

Correct Answer
verified

Earthworms use their hydrostatic skeletons to move through the soil.As earthworms move through the soil they

Correct Answer
verified

The use-dependent decrease in the ability of a muscle to generate force is called ______.

Correct Answer
verified

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Correct Answer
verified

Insects such as mosquitoes and beetles can beat their wings at tremendous speeds.This can be accomplished because

Correct Answer
verified

Sustained contraction is called

Correct Answer
verified

Which of these is not part of the axial skeleton?

Correct Answer
verified

Select the incorrect statement about muscle fibers.

Correct Answer
verified

Which of the following joint types is not correctly matched with its example?

Correct Answer
verified

Exam 47: The Musculoskeletal System

The repeating units of myofibrils are made from contractile subunits called sarcomeres.Which of these is not part of the sarcomere's structure?

Correct AnswerverifiedShow Answer

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Correct AnswerverifiedShow Answer

How would you compare the onset of rigor mortis with a frog versus a rat?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The myofibrils consist of both thin filaments made of actin proteins,and thick filaments composed of

Correct AnswerverifiedShow Answer

Which of the developmental schemes for bone is not possible?

Correct AnswerverifiedShow Answer

According to the figure,which one represents the muscle in an optimal condition for contraction?

Correct AnswerverifiedShow Answer

Which of the following panels best represents the power stroke?

Correct AnswerverifiedShow Answer

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Correct AnswerverifiedShow Answer

Succinylcholine chloride,a depolarizing acetylcholine agonist,was lethally injected into the circulatory system of a bear.What effect would this have?

Correct AnswerverifiedShow Answer

_________ is a sustained muscle contraction.

Correct AnswerverifiedShow Answer

The interaction between __________ can be described as the forming of cross-bridges.

Correct AnswerverifiedShow Answer

Earthworms use their hydrostatic skeletons to move through the soil.As earthworms move through the soil they

Correct AnswerverifiedShow Answer

The use-dependent decrease in the ability of a muscle to generate force is called ______.

Correct AnswerverifiedShow Answer

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Correct AnswerverifiedShow Answer

Insects such as mosquitoes and beetles can beat their wings at tremendous speeds.This can be accomplished because

Correct AnswerverifiedShow Answer

Sustained contraction is called

Correct AnswerverifiedShow Answer

Which of these is not part of the axial skeleton?

Correct AnswerverifiedShow Answer

Select the incorrect statement about muscle fibers.

Correct AnswerverifiedShow Answer

Which of the following joint types is not correctly matched with its example?

Correct AnswerverifiedShow Answer

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