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Muscle Physiology:
1) Skeletal muscle is described by all of the following EXCEPT:
a) striated
b) voluntary
c) multinucleate
d) autorhythmic
2) The walls of hollow organs and some blood vessels contain this muscle
tissue:
a) striated
b) skeletal
c) cardiac
d) smooth
3) Which of the following is unique to cardiac muscle tissue:
a) is
involuntary
b) is non-striated
c) has intercalated
discs
d) contains smooth muscle tissue
4) Approximately what percentage of body heat is generated by muscle
tissue:
a) 15%
b) 30%
c)
55%
d) 85%
e) 98%
5) A muscle fascicle is a:
a) bundle of
myofibrils
b) bundle of connective tissue
c) bundle of muscle fibers
d) muscle cell
6) The smallest contractile unit of skeletal muscle is a:
a) sarcomere
b) motor unit
c) synapse
d) thin filament
7) The major regulatory proteins in muscle tissue are:
a) myosin and tropomyosin
b) myosin and actin
c) actin and troponin
d) troponin and tropomyosin
8) Which of the following actions is caused by skeletal muscle:
a) constriction of blood vessels
b) heartbeat
c) dilation of pupil
d) eye movements
9) Which of the following does NOT occur in a muscle during contraction:
a) thick and thin filaments bind to each
other
b) muscle fibers stretch
c) thick and thin filaments "slide" past
each other
d) muscle fibers shorten
10) This process aids in skeletal muscle relaxation after contraction:
a) calcium is released from intracellular
storage sites
b) motor neurons send
electrical signal to muscle
c)
acetylcholinesterease degrades acetylcholine
d) troponin binds calcium
11) The stiffness of muscle tissue in rigor mortis partially results from:
a) excessive acetycholine activity on muscle
b) excessive calcium release in muscle
c) excessive lactic acid build up
d) excessive contraction of the fibers
12) A single motor neuron may innervate as few as 3-5 fibers in muscles of
the:
a) upper arms
b) legs
c)
eye
d) heart
13) When an action potential reaches the presynaptic terminal of the motor
neuron:
a) calcium is released inside of the
muscle fiber
b) acetylcholine is released
into the synaptic cleft
c)
acetylcholinesterease is released into the synaptic cleft
d) physical contact between the motor neuron
and the muscle fiber occurs
14) Lack of acetylcholinesterase in the synaptic cleft would result in:
a) decrease acetylcholine production by the
motor neuron
b) relaxation of the muscle
fiber
c) excessive, continuous stimulation
of the muscle fiber
d) inability of the
motor neuron to stimulate the muscle fiber
15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue.
This would result in:
a) increased
stimulation of the muscle fiber
b) inability
of the muscle to respond to motor nerve stimulus
c) contraction of the muscle fiber
d) excessive contractions and convulsions
16) Training excersizes such as jogging, swimming and aerobics have this
effect on skeletal muscle tissue:
a)
increase number of mitochondria per muscle
fiber
b) increase number of muscle fibers
c) increase number of motor units
d) increase number of skeletal muscles
17) Muscular dystrophy is a congenital disorder characterized by
a) skeletal muscle degeneration
b) excessive convulsions
c) shaking and trembling
d) only cardiac damage
18) Which of the following muscular disorders characterized by painful
musculoskeletal "tender points":
a)
fibromyalgia
b) myasthenia gravis
c) Duchenne muscular dystrophy
d) Becker muscular dystrophy
19) Anabolic steroids have all these effects except:
a) builds muscle proteins
b) increases muscle strength
c) increases number of muscles in the body
d) can result in liver cancer and heart
disease
20) Which of the following statements regarding aging and the muscular
system is true:
a) aging is associated with
decreased myoglobin production
b) the
effects of aging can be nearly completely reversed
c) satellite cells increase in aging
causing fibrosis
d) young persons have
more adipose in muscles compared to elderly persons
Answers:
1) Skeletal muscle is
described by all of the following EXCEPT:
a)
striated
b) voluntary
c) multinucleate
d) autorhythmic
2) The walls of hollow organs and some blood vessels contain this muscle
tissue:
a) striated
b) skeletal
c) cardiac
d) smooth
3) Which of the following is unique to cardiac muscle tissue:
a) is
involuntary
b) is non-striated
c) has intercalated
discs
d) contains smooth muscle
tissue
4) Approximately what percentage of body heat is generated by muscle
tissue:
a) 15%
b) 30%
c)
55%
d) 85%
e) 98%
5) A muscle fascicle is a:
a) bundle of
myofibrils
b) bundle of connective tissue
c) bundle of muscle fibers
d) muscle cell
6) The smallest contractile unit of skeletal muscle is a:
a) sarcomere
b) motor unit
c) synapse
d) thin filament
7) The major regulatory proteins in muscle tissue are:
a) myosin and tropomyosin
b) myosin and actin
c) actin and troponin
d) troponin and tropomyosin
8) Which of the following actions is caused by skeletal muscle:
a) constriction of blood vessels
b) heartbeat
c) dilation of pupil
d) eye
movements
9) Which of the following does NOT occur in a muscle during contraction:
a) thick and thin filaments bind to each
other
b) muscle fibers stretch
c) thick and thin filaments "slide" past
each other
d) muscle fibers shorten
10) This process aids in skeletal muscle relaxation after contraction:
a) calcium is released from intracellular
storage sites
b) motor neurons send
electrical signal to muscle
c)
acetylcholinesterease degrades acetylcholine
d) troponin binds calcium
11) The stiffness of muscle tissue in rigor mortis partially results from:
a) excessive acetycholine activity on muscle
b) excessive calcium release in muscle
c) excessive lactic acid build up
d) excessive contraction of the fibers
12) A single motor neuron may innervate as few as 3-5 fibers in muscles of
the:
a) upper arms
b) legs
c) eye
d) heart
13) When an action potential reaches the presynaptic terminal of the motor
neuron:
a) calcium is released inside of the
muscle fiber
b) acetylcholine is released
into the synaptic cleft
c)
acetylcholinesterease is released into the synaptic cleft
d) physical contact between the motor neuron
and the muscle fiber occurs
14) Lack of acetylcholinesterase in the synaptic cleft would result in:
a) decrease acetylcholine production by the
motor neuron
b) relaxation of the muscle
fiber
c) excessive, continuous
stimulation of the muscle fiber
d)
inability of the motor neuron to stimulate the muscle fiber
15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue.
This would result in:
a) increased
stimulation of the muscle fiber
b)
inability of the muscle to respond to motor nerve stimulus
c) contraction of the muscle fiber
d) excessive contractions and convulsions
16) Training excersizes such as jogging, swimming and aerobics have this
effect on skeletal muscle tissue:
a)
increase number of mitochondria per muscle
fiber
b) increase number of muscle fibers
c) increase number of motor units
d) increase number of skeletal muscles
17) Muscular dystrophy is a congenital disorder characterized by
a) skeletal muscle degeneration
b) excessive convulsions
c) shaking and trembling
d) only cardiac damage
18) Which of the following disorders is characterized by painful
musculoskeletal "tender points":
a)
fibromyalgia
b) myasthenia gravis
c) Duchenne muscular dystrophy
d) Becker muscular dystrophy
19) Anabolic steroids have all these effects except:
a) builds muscle proteins
b) increases muscle strength
c) increases number of muscles in the
body
d) can result in liver cancer and
heart disease
20) Which of the following statements regarding aging and the muscular
system is true:
a) aging is associated
with decreased myoglobin production
b) the effects of aging can be
nearly completely reversed
c)
satellite cells increase in aging causing fibrosis
d) young persons have more adipose in
muscles compared to elderly persons