Question 1

Which of the following statements about fast-twitch and slow-twitch fibers is false?

Accepted Answer

A)  In skeletal muscle, the most important factor determining the proportion of fast- and slow-twitch fibers is genetic heritage. 
B)  Aerobic training increases the oxidative capacity of intermediate fibers. 
C)  A single muscle may contain fast- and slow-twitch fibers. 
D)  Fast-twitch fibers fatigue slowly. 
E)  All of the above are true; none is false. 
A)  In skeletal muscle, the most important factor determining the proportion of fast- and slow-twitch fibers is genetic heritage. 
B)  Aerobic training increases the oxidative capacity of intermediate fibers. 
C)  A single muscle may contain fast- and slow-twitch fibers. 
D)  Fast-twitch fibers fatigue slowly. 
E)  All of the above are true; none is false.

Question 2

Human bodies have which of the following types of joints?

Accepted Answer

A)  Ball-and-socket 
B)  Hinge 
C)  Pivot 
D)  Saddle and ellipsoid 
E)  All of the above 
A)  Ball-and-socket 
B)  Hinge 
C)  Pivot 
D)  Saddle and ellipsoid 
E)  All of the above

Question 3

Which statement about skeletal muscle contraction is not true?

Accepted Answer

A)  A single action potential at the neuromuscular junction is sufficient to cause a muscle to twitch. 
B)  Once maximum muscle tension is achieved, no ATP is required to maintain that level of tension. 
C)  An action potential in the muscle cell activates contraction by releasing Ca2+ into the sarcoplasm. 
D)  Summation of twitches leads to a graded increase in the tension that can be generated by a single muscle fiber. 
E)  The tension generated by a muscle can be varied by controlling how many of its motor units are active. 
A)  A single action potential at the neuromuscular junction is sufficient to cause a muscle to twitch. 
B)  Once maximum muscle tension is achieved, no ATP is required to maintain that level of tension. 
C)  An action potential in the muscle cell activates contraction by releasing Ca2+ into the sarcoplasm. 
D)  Summation of twitches leads to a graded increase in the tension that can be generated by a single muscle fiber. 
E)  The tension generated by a muscle can be varied by controlling how many of its motor units are active.

Question 4

Use the following to answer questions:
Match the correct muscle type from the list below with each description that follows. Each term may be used more than once.
-Which muscle type has a pacemaking function?

Accepted Answer

A) Smooth 
B) Cardiac 
C) Skeletal 
A) Smooth 
B) Cardiac 
C) Skeletal

Question 5

A sport like weight lifting, which is very demanding and leads quickly to fatigue, is reliant on _______ fibers.

Accepted Answer

The answer of A sport like weight lifting, which is...

Question 6

Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is false?

Accepted Answer

A)  A thin filament consists of actin and tropomyosin. 
B)  Two chains of actin monomers are twisted into a helix. 
C)  Two strands of tropomyosin lie in the grooves of the actin. 
D)  Troponin forms the head of the myosin molecule. 
E)  The myosin heads have ATPase activity and interact with the actin. 
A)  A thin filament consists of actin and tropomyosin. 
B)  Two chains of actin monomers are twisted into a helix. 
C)  Two strands of tropomyosin lie in the grooves of the actin. 
D)  Troponin forms the head of the myosin molecule. 
E)  The myosin heads have ATPase activity and interact with the actin.

Question 7

The neuromuscular junction

Accepted Answer

A)  is the junction between the neuron and the skeletal muscle. 
B)  causes the release of neurotransmitter. 
C)  hyperpolarizes the sarcolemma. 
D)  is located at the tip of the T tubule. 
E)  consists of many motor units. 
A)  is the junction between the neuron and the skeletal muscle. 
B)  causes the release of neurotransmitter. 
C)  hyperpolarizes the sarcolemma. 
D)  is located at the tip of the T tubule. 
E)  consists of many motor units.

Question 8

The human elbow consists of a _______ joint.

Accepted Answer

A)  ball-and-socket 
B)  pivot 
C)  hinge 
D)  saddle 
E)  plane 
A)  ball-and-socket 
B)  pivot 
C)  hinge 
D)  saddle 
E)  plane

Question 9

Which of the following statements about the endoskeletons of vertebrates is false?

Accepted Answer

A)  The muscles are attached to a living support structure. 
B)  The rib bones are part of the appendicular skeleton. 
C)  Molting is unnecessary in animals with endoskeletons. 
D)  Endoskeletons consist of bone and cartilage. 
E)  At least two bones are required to form a joint. 
A)  The muscles are attached to a living support structure. 
B)  The rib bones are part of the appendicular skeleton. 
C)  Molting is unnecessary in animals with endoskeletons. 
D)  Endoskeletons consist of bone and cartilage. 
E)  At least two bones are required to form a joint.

Question 10

All of the following are types of joints except

Accepted Answer

A)  ball and socket. 
B)  the pivot. 
C)  the flip. 
D)  the hinge. 
E)  the ellipsoid. 
A)  ball and socket. 
B)  the pivot. 
C)  the flip. 
D)  the hinge. 
E)  the ellipsoid.

Question 11

Given the total energy supply in the human body (in the form of ATP and creatine phosphate), how long is it possible to sit at rest without replenishing the supply?

Accepted Answer

A)  30 seconds 
B)  10 minutes 
C)  5 minutes 
D)  30 minutes 
E)  1 second 
A)  30 seconds 
B)  10 minutes 
C)  5 minutes 
D)  30 minutes 
E)  1 second

Question 12

Use the following to answer questions:
Match the correct muscle type from the list below with each description that follows. Each term may be used more than once.
-Which muscle type uses calcium to trigger actin-myosin interactions for movement?

Accepted Answer

A) Smooth 
B) Cardiac 
C) Skeletal 
A) Smooth 
B) Cardiac 
C) Skeletal

Question 13

Which of the following statements about cartilage and bone is false?

Accepted Answer

A)  Some vertebrates are composed entirely of cartilage, with no bone. 
B)  Some vertebrates are composed entirely of bone, with no cartilage. 
C)  Bone has crystals of calcium phosphate. 
D)  The endoskeleton in many vertebrates serves as a reservoir of calcium. 
E)  The principal protein in cartilage is collagen. 
A)  Some vertebrates are composed entirely of cartilage, with no bone. 
B)  Some vertebrates are composed entirely of bone, with no cartilage. 
C)  Bone has crystals of calcium phosphate. 
D)  The endoskeleton in many vertebrates serves as a reservoir of calcium. 
E)  The principal protein in cartilage is collagen.

Question 14

A storage compound in muscles called _______ is part of the immediate system for obtaining ATP.

Accepted Answer

The answer of A storage compound in muscles called _______...

Question 15

The strength or weakness of a muscle contraction depends on the number of motor units activated and the frequency at which they are firing. An increase in either of these two factors allows for graded contractions through the process of

Accepted Answer

A)  transmission. 
B)  transduction. 
C)  multiplication. 
D)  summation. 
E)  coordination. 
A)  transmission. 
B)  transduction. 
C)  multiplication. 
D)  summation. 
E)  coordination.

Question 16

Why does weight-bearing exercise help prevent osteoporosis?

Accepted Answer

Osteoporosis is a decrease in bone densi

Question 17

Which of the following muscle types provides contractile force for internal organs?

Accepted Answer

A)  Rough 
B)  Smooth 
C)  Skeletal 
D)  Cardiac 
E)  Striated 
A)  Rough 
B)  Smooth 
C)  Skeletal 
D)  Cardiac 
E)  Striated

Question 18

Which of the following is not a type of skeletal system?

Accepted Answer

A)  Pneumatic 
B)  Hydrostatic 
C)  Endoskeleton 
D)  Exoskeleton 
E)  Bones and cartilage 
A)  Pneumatic 
B)  Hydrostatic 
C)  Endoskeleton 
D)  Exoskeleton 
E)  Bones and cartilage

Question 19

Muscle fibers show a range of responses to different levels of stimulation because

Accepted Answer

A)  each muscle fiber contraction is "all or none." 
B)  the availability of Ca2+ sets an upper limit to the strength of the contraction. 
C)  a new contraction can occur only after the resting condition is reached. 
D)  following stimulation, the fiber stays contracted. 
E)  individual twitches in the same fiber can summate. 
A)  each muscle fiber contraction is "all or none." 
B)  the availability of Ca2+ sets an upper limit to the strength of the contraction. 
C)  a new contraction can occur only after the resting condition is reached. 
D)  following stimulation, the fiber stays contracted. 
E)  individual twitches in the same fiber can summate.

Question 20

Slow-twitch muscles

Accepted Answer

A)  are also called oxidative muscle. 
B)  are also called red muscle. 
C)  are well supplied with mitochondria. 
D)  contain the oxygen-binding protein myoglobin. 
E)  All of the above 
A)  are also called oxidative muscle. 
B)  are also called red muscle. 
C)  are well supplied with mitochondria. 
D)  contain the oxygen-binding protein myoglobin. 
E)  All of the above

Exam 48: Musculoskeletal Systems

Which of the following statements about fast-twitch and slow-twitch fibers is false?

Human bodies have which of the following types of joints?

Which statement about skeletal muscle contraction is not true?

Use the following to answer questions: Match the correct muscle type from the list below with each description that follows. Each term may be used more than once. -Which muscle type has a pacemaking function?

A sport like weight lifting, which is very demanding and leads quickly to fatigue, is reliant on _______ fibers.

Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is false?

The neuromuscular junction

The human elbow consists of a _______ joint.

Which of the following statements about the endoskeletons of vertebrates is false?

All of the following are types of joints except

Given the total energy supply in the human body (in the form of ATP and creatine phosphate), how long is it possible to sit at rest without replenishing the supply?

Use the following to answer questions: Match the correct muscle type from the list below with each description that follows. Each term may be used more than once. -Which muscle type uses calcium to trigger actin-myosin interactions for movement?

Which of the following statements about cartilage and bone is false?

A storage compound in muscles called _______ is part of the immediate system for obtaining ATP.

The strength or weakness of a muscle contraction depends on the number of motor units activated and the frequency at which they are firing. An increase in either of these two factors allows for graded contractions through the process of

Why does weight-bearing exercise help prevent osteoporosis?

Which of the following muscle types provides contractile force for internal organs?

Which of the following is not a type of skeletal system?

Muscle fibers show a range of responses to different levels of stimulation because

Slow-twitch muscles

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