Question 1

Refer to the graphs comparing the amount of tension generated by slow-twitch versus fast-twitch muscle fibers.  Graph _______ would most likely be associated with a sprinter.

Accepted Answer

The answer of Refer to the graphs comparing the amount...

Question 2

In which scenario do skeletal muscles pull on other skeletal muscles, rather than pulling on a skeleton?

Accepted Answer

A)   A person performing a chin-up
B)   An elephant moving its trunk
C)   A person turning her head from left to right
D)   Muscle contractions being used to maintain posture
E)   A lobster moving its legsF) C) and D)
G) A) and E)

Question 3

A mutation results in a developmental defect that stops the ionic current from flowing from cell to cell in cardiac muscle.Which structure(s)  is/are most likely defective as a result of this mutation?

Accepted Answer

A)   Sarcomeres
B)   Titin
C)   Actin
D)   Neuromuscular junctions
E)   Gap junctionsF) A) and C)
G) C) and D)

Question 4

Which statement about neuromuscular junctions is true?

Accepted Answer

A)   They are found in skeletal muscle between sensory neurons and muscle cells.
B)   A single motor neuron innervates more than one skeletal muscle cell.
C)   An action potential at the junction ultimately causes the sarcolemma to hyperpolarize.
D)   An action potential arriving at the junction causes the release of Ca2+ from the neuron terminal.
E)   Axons from neurons terminate on each myofibril within the muscle cell.F) C) and E)
G) B) and D)

Question 5

Which muscle type(s)  has/have numerous nuclei per muscle cell?

Accepted Answer

A)   Smooth muscle only
B)   Cardiac muscle only
C)   Skeletal muscle only
D)   Both smooth and cardiac muscle, but not skeletal muscle
E)   Smooth, cardiac, and skeletal muscleF) A) and B)
G) C) and D)

Question 6

Refer to the figure showing the performance of different muscle fiber types in the leg muscles of an athlete.The lower panels show the proportion of muscle fiber types in these muscles.The colors of the fibers match the color of the lines in the graphs corresponding to that fiber type.  It is most likely that athlete represented by lower panel A can run _______ than the athlete represented by lower panel B.

Accepted Answer

The answer of Refer to the figure showing the performance...

Question 7

An individual sarcomere unit consists primarily of

Accepted Answer

A)   a stack of actin fibers, only.
B)   a stack of myosin units, only.
C)   overlapping actin and membrane.
D)   overlapping myosin and membrane.
E)   overlapping actin and myosin.F) C) and D)
G) A) and D)

Question 8

Flexor and extensor muscles work _______ to operate a joint.

Accepted Answer

A)   synergistically
B)   antagonistically
C)   separately
D)   consecutively
E)   end-to-endF) A) and B)
G) All of the above

Question 9

Which statement about bone is true?

Accepted Answer

A)   Astronauts who spend long periods of time in zero gravity experience decalcification of their bones.
B)   Osteoclasts are derived from the lineage of cells that produce osteocytes.
C)   Most bones are made entirely of compact bone.
D)   Once bones have finished growing, they remain the same shape and density until old age, when thinning of the matrix can occur.
E)   Osteoclasts lay down bone in layers, creating compact bone.F) A) and E)
G) A) and D)

Question 10

Cells in _______ muscle tissue are joined by intercalated discs.

Accepted Answer

The answer of Cells in _______ muscle tissue are joined...

Question 11

Which statement about cardiac muscle cells is true?

Accepted Answer

A)   The DHP proteins are in the sarcoplasmic reticulum membrane.
B)   There is a physical connection between DHP and ryanodine receptors.
C)   The T tubules are smaller than those of skeletal muscle cells.
D)   Ryanodine receptors are ion-gated Na+ channels.
E)   Extracellular Ca2+ flows into the cytoplasm through DHP channels and then opens calcium channels in the sarcoplasmic reticulum.F) A) and E)
G) B) and D)

Question 12

At a turkey dinner, you tell your host you would like to be served mostly fast-twitch muscle.To comply, your host serves you

Accepted Answer

A)   a drumstick.
B)   a thigh.
C)   the gizzard.
D)   the heart.
E)   a slice of breast meat.F) B) and D)
G) A) and B)

Question 13

Which feature characterizes hydrostatic skeletons?

Accepted Answer

A)   Found primarily in vertebrates
B)   Consist of a fluid-filled body cavity surrounded by a stiff cuticle
C)   Require molting when the animal grows
D)   Used by clams in locomotion
E)   Contraction of one set of muscles causes the fluid-filled body cavity to bulge in the opposite direction.F) B) and D)
G) A) and B)

Question 14

_______ lay down new bone, and _______ dissolve bone.

Accepted Answer

A)   Osteoclasts; osteoblasts
B)   Osteocytes; osteoclasts
C)   Osteoblasts; osteoclasts
D)   Osteoblasts; osteocytes
E)   Osteocytes; osteoblastsF) C) and D)
G) None of the above

Question 15

Refer to the figure showing a micrograph of bone.  In this section of compact bone, the cells located at A are called _______, and they _______.

Accepted Answer

A)   osteocytes; communicate with other bone cells through cellular extensions that run through tiny channels
B)   osteocytes; break down bone matrix
C)   osteoblasts; communicate with other bone cells through cellular extensions that run through tiny channels
D)   osteoclasts; communicate with other bone cells through cellular extensions that run through tiny channels
E)   osteoclasts; break down bone matrixF) A) and E)
G) B) and E)

Question 16

Which of the following would likely have the highest proportion of slow-twitch fibers?

Accepted Answer

A)   Muscles of the arm
B)   Muscle controlling elevation of the eyelid
C)   Postural muscles of the neck and spine
D)   Muscles in the fingers
E)   Muscles of the shoulderF) C) and D)
G) B) and D)

Question 17

Which event is not associated with the interaction between actin and myosin?

Accepted Answer

A)   A change in the myosin head conformation causes the head to bend.
B)   ATP is formed by the interaction.
C)   Myosin heads bind specific sites on actin, forming cross-bridges.
D)   The actin filament moves relative to the myosin filament.
E)   A change in the myosin head conformation releases actin.F) All of the above
G) A) and B)

Question 18

The pages of a typical textbook move around the binding as if it were a _______ joint, like the _______.

Accepted Answer

A)   ball-and-socket; shoulder
B)   pivot; elbow
C)   hinge; knee
D)   saddle; ankle
E)   plane; ankleF) A) and E)
G) B) and C)

Question 19

Refer to the figure showing the structure of a skeletal muscle.  When the woman in the figure extends her arms so they are hanging down at her sides, which structures will lengthen, which will shorten, and which will stay the same?

Accepted Answer

When the woman extends her arm, her bice...

Question 20

The role of tendons is to join

Accepted Answer

A)   two bones.
B)   two ligaments.
C)   bone and ligament.
D)   muscle and ligament.
E)   muscle and bone.F) A) and B)
G) D) and E)

Exam 47: Musculoskeletal Systems

Which event is not associated with the interaction between actin and myosin?

Correct Answer
verified

At a turkey dinner, you tell your host you would like to be served mostly fast-twitch muscle.To comply, your host serves you

Correct Answer
verified

In which scenario do skeletal muscles pull on other skeletal muscles, rather than pulling on a skeleton?

Correct Answer
verified

Flexor and extensor muscles work _______ to operate a joint.

Correct Answer
verified

An individual sarcomere unit consists primarily of

Correct Answer
verified

Which of the following would likely have the highest proportion of slow-twitch fibers?

Correct Answer
verified

_ lay down new bone, and _ dissolve bone.

Correct Answer
verified

Which muscle type(s) has/have numerous nuclei per muscle cell?

Correct Answer
verified

Which feature characterizes hydrostatic skeletons?

Correct Answer
verified

The pages of a typical textbook move around the binding as if it were a _ joint, like the _.

Correct Answer
verified

Which statement about cardiac muscle cells is true?

Correct Answer
verified

Refer to the figure showing a micrograph of bone. In this section of compact bone, the cells located at A are called _, and they _.

Correct Answer
verified

Refer to the graphs comparing the amount of tension generated by slow-twitch versus fast-twitch muscle fibers. Graph _______ would most likely be associated with a sprinter.

Correct Answer
verified

Correct Answer
verified

Cells in _______ muscle tissue are joined by intercalated discs.

Correct Answer
verified

A mutation results in a developmental defect that stops the ionic current from flowing from cell to cell in cardiac muscle.Which structure(s) is/are most likely defective as a result of this mutation?

Correct Answer
verified

The role of tendons is to join

Correct Answer
verified

Which statement about neuromuscular junctions is true?

Correct Answer
verified

Refer to the figure showing the structure of a skeletal muscle. When the woman in the figure extends her arms so they are hanging down at her sides, which structures will lengthen, which will shorten, and which will stay the same?

Correct Answer
verified
When the woman extends her arm, her bice...
View Answer

Which statement about bone is true?

Correct Answer
verified

Exam 47: Musculoskeletal Systems

Which event is not associated with the interaction between actin and myosin?

Correct AnswerverifiedShow Answer

At a turkey dinner, you tell your host you would like to be served mostly fast-twitch muscle.To comply, your host serves you

Correct AnswerverifiedShow Answer

In which scenario do skeletal muscles pull on other skeletal muscles, rather than pulling on a skeleton?

Correct AnswerverifiedShow Answer

Flexor and extensor muscles work _______ to operate a joint.

Correct AnswerverifiedShow Answer

An individual sarcomere unit consists primarily of

Correct AnswerverifiedShow Answer

Which of the following would likely have the highest proportion of slow-twitch fibers?

Correct AnswerverifiedShow Answer

_______ lay down new bone, and _______ dissolve bone.

Correct AnswerverifiedShow Answer

Which muscle type(s) has/have numerous nuclei per muscle cell?

Correct AnswerverifiedShow Answer

Which feature characterizes hydrostatic skeletons?

Correct AnswerverifiedShow Answer

The pages of a typical textbook move around the binding as if it were a _______ joint, like the _______.

Correct AnswerverifiedShow Answer

Which statement about cardiac muscle cells is true?

Correct AnswerverifiedShow Answer

Refer to the figure showing a micrograph of bone. In this section of compact bone, the cells located at A are called _______, and they _______.

Correct AnswerverifiedShow Answer

Refer to the graphs comparing the amount of tension generated by slow-twitch versus fast-twitch muscle fibers. Graph _______ would most likely be associated with a sprinter.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Cells in _______ muscle tissue are joined by intercalated discs.

Correct AnswerverifiedShow Answer

A mutation results in a developmental defect that stops the ionic current from flowing from cell to cell in cardiac muscle.Which structure(s) is/are most likely defective as a result of this mutation?

Correct AnswerverifiedShow Answer

The role of tendons is to join

Correct AnswerverifiedShow Answer

Which statement about neuromuscular junctions is true?

Correct AnswerverifiedShow Answer

Refer to the figure showing the structure of a skeletal muscle. When the woman in the figure extends her arms so they are hanging down at her sides, which structures will lengthen, which will shorten, and which will stay the same?

Correct AnswerverifiedWhen the woman extends her arm, her bice...View AnswerShow Answer

Which statement about bone is true?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

_ lay down new bone, and _ dissolve bone.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The pages of a typical textbook move around the binding as if it were a _ joint, like the _.

Correct Answer
verified

Correct Answer
verified

Refer to the figure showing a micrograph of bone. In this section of compact bone, the cells located at A are called _, and they _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
When the woman extends her arm, her bice...
View Answer

Correct Answer
verified