Question 1

Ca2+ binds to _______ in skeletal muscle and leads to exposure of the binding site for _______ on the _______ filament.

Accepted Answer

A)  troponin; myosin; actin 
B)  troponin; actin; myosin 
C)  actin; myosin; troponin 
D)  tropomyosin; myosin; actin 
E)  myosin; actin; troponin 
A)  troponin; myosin; actin 
B)  troponin; actin; myosin 
C)  actin; myosin; troponin 
D)  tropomyosin; myosin; actin 
E)  myosin; actin; troponin

Question 2

The exoskeleton of clams contains

Accepted Answer

A)  calcium carbonate. 
B)  cartilage. 
C)  chitin. 
D)  collagen. 
E)  cuticle. 
A)  calcium carbonate. 
B)  cartilage. 
C)  chitin. 
D)  collagen. 
E)  cuticle.

Question 3

Which of the following statements about smooth muscle is false?

Accepted Answer

A)  Smooth muscle is under the control of the autonomic nervous system. 
B)  Smooth muscle cells are multinucleate. 
C)  Smooth muscle appears unstriated when viewed with the microscope. 
D)  Gap junctions are common in smooth muscle. 
E)  Stretched smooth muscle will contract. 
A)  Smooth muscle is under the control of the autonomic nervous system. 
B)  Smooth muscle cells are multinucleate. 
C)  Smooth muscle appears unstriated when viewed with the microscope. 
D)  Gap junctions are common in smooth muscle. 
E)  Stretched smooth muscle will contract.

Question 4

Aerobic exercise such as jogging increases

Accepted Answer

A)  myoglobin. 
B)  the number of mitochondria in skeletal muscle cells. 
C)  the enzymes involved in energy utilization. 
D)  the density of capillaries. 
E)  All of the above 
A)  myoglobin. 
B)  the number of mitochondria in skeletal muscle cells. 
C)  the enzymes involved in energy utilization. 
D)  the density of capillaries. 
E)  All of the above

Question 5

How do actin and myosin molecules interact?

Accepted Answer

A)  Globular myosin heads bind to actin filaments. 
B)  Globular actin heads bind to myosin filaments. 
C)  Other proteins connect the two. 
D)  Myosin filaments bend to connect to actin. 
E)  Actin filaments bend to connect to myosin. 
A)  Globular myosin heads bind to actin filaments. 
B)  Globular actin heads bind to myosin filaments. 
C)  Other proteins connect the two. 
D)  Myosin filaments bend to connect to actin. 
E)  Actin filaments bend to connect to myosin.

Question 6

Anaerobic exercise such as weight lifting

Accepted Answer

A)  increases strength. 
B)  can do minor tissue damage. 
C)  induces the formation of new actin and myosin filaments in existing muscle fibers. 
D)  produces bigger muscle fibers and hence bigger muscles. 
E)  All of the above 
A)  increases strength. 
B)  can do minor tissue damage. 
C)  induces the formation of new actin and myosin filaments in existing muscle fibers. 
D)  produces bigger muscle fibers and hence bigger muscles. 
E)  All of the above

Question 7

Sites of elongation between the ossified regions of long bones are called

Accepted Answer

A)  glue lines. 
B)  fulcrums. 
C)  hinge joints. 
D)  epiphyseal plates. 
E)  Haversian systems. 
A)  glue lines. 
B)  fulcrums. 
C)  hinge joints. 
D)  epiphyseal plates. 
E)  Haversian systems.

Question 8

Insects can beat their wings at exceptionally high frequencies because

Accepted Answer

A)  their wing muscles have mostly fast-twitch fibers. 
B)  their motor neurons can fire action potentials at a very high frequency. 
C)  their wings have exoskeletal supports. 
D)  their wing muscles have extensive sarcoplasmic reticulum that cycles Ca2+ very fast. 
E)  their wing muscles can generate a rapid oscillation of contraction asynchronous with motor neuron firing. 
A)  their wing muscles have mostly fast-twitch fibers. 
B)  their motor neurons can fire action potentials at a very high frequency. 
C)  their wings have exoskeletal supports. 
D)  their wing muscles have extensive sarcoplasmic reticulum that cycles Ca2+ very fast. 
E)  their wing muscles can generate a rapid oscillation of contraction asynchronous with motor neuron firing.

Question 9

Which of the following muscle types contains numerous myofibrils?

Accepted Answer

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

Question 10

White muscle and red muscle are found in different parts of the body and are used for different types of movement. What are the physiological and morphological characteristics that distinguish the two types of muscle?

Accepted Answer

Fast-twitch fibers are known as white mu

Exam 48: Musculoskeletal Systems

Ca2+ binds to _______ in skeletal muscle and leads to exposure of the binding site for _______ on the _______ filament.

The exoskeleton of clams contains

Which of the following statements about smooth muscle is false?

Aerobic exercise such as jogging increases

How do actin and myosin molecules interact?

Anaerobic exercise such as weight lifting

Sites of elongation between the ossified regions of long bones are called

Insects can beat their wings at exceptionally high frequencies because

Which of the following muscle types contains numerous myofibrils?

White muscle and red muscle are found in different parts of the body and are used for different types of movement. What are the physiological and morphological characteristics that distinguish the two types of muscle?

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Ca²⁺ binds to ___ in skeletal muscle and leads to exposure of the binding site for _ on the _____ filament.