NAT 501 Module 4 Test With 100%
Complete Solution
When a sarcomere contracts and thin filaments move over thick filaments you would
expect to see ________.
a. the I bands to appear smaller
b. the H zone to appear wider
c. the I bands to appear wider
d. the A band to appear darker - ANSWER a
Although there are no sarcomeres, smooth muscle still possesses thick and thin
filaments.
True
False - ANSWER true
Curare is a poisonous plant extract. Curare molecules have a chemical structure like
the neurotransmitter ACh. Curare can bind to the ACh receptor site on the chemically
gated ion channels in the motor end plate. Even though curare will bind to the receptor
site it will not open the ion channel and no ions will pass through. What do you think the
symptoms of curare poisoning would look like?
a. Muscles will respond too quickly and cause a severe tremor.
b. Curare will only affect cardiac muscle, causing fibrillations of the heart.
c. Curare will only affect muscles with ACh receptors, paralyzing them.
d. Smooth muscles will become stimulated causing quick movement of nutrients through
the digestive system. - ANSWER c
Which of the following is the correct sequence of events for muscle contractions?
a. motor neuron action potential, neurotransmitter release, muscle cell action potential,
release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
b. neurotransmitter release, muscle cell action potential, motor neuron action potential,
release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
c. muscle cell action potential, neurotransmitter release, ATP-driven power stroke,
calcium ion release from SR, sliding of myofilaments
,d. neurotransmitter release, motor neuron action potential, muscle cell action potential,
release of calcium ions from SR, ATP-driven power stroke - ANSWER a
Which of the following statements is true?
a. Cardiac muscle cells have many nuclei.
b. Smooth muscle cells have T tubules.
c. Striated muscle cells are long and cylindrical with many nuclei.
d. Cardiac muscle cells are found in the heart and large blood vessels. - ANSWER c
Hypothetically, if a muscle were stretched to the point where thick and thin filaments no
longer overlapped, ________.
a. cross bridge attachment would be optimum because of all the free binding sites on
actin
b. no muscle tension could be generated
c. maximum force production would result because the muscle has a maximum range of
travel
d. ATP consumption would increase because the sarcomere is "trying" to contract -
ANSWER b
Approximately 80% of a muscle fiber's volume are the myofibrils. This characteristic
reflects muscles ability to ________.
a. produce relatively high amounts of ATP
b. store oxygen molecules that can be used in aerobic respiration
c. produce movement through contractile force
d. generate and propagate action potential - ANSWER c
A potential benefit of recruiting slow oxidative fibers for contraction before recruiting
fast oxidative and fast glycolytic fibers might be ________.
a. to allow for fine control with delicate contractile force with a small stimulus
b. because they are slower to respond, slow oxidative fibers must be stimulated first in
order to contract simultaneously with the faster fibers
c. recruiting slow oxidative fibers early helps to tire them out first so that they won't
interfere with the more powerful contractions of fast glycolytic fibers
d. There is little to no benefit from recruiting slow oxidative fibers first, and therefore it
is in fact fast glycolytic fibers that will be recruited first. - ANSWER a
, Which of the following describes a bipennate pattern of fascicles?
a. An arrangement that looks like many feathers side by side.
b. An arrangement in which the fascicles insert into only one side of a tendon.
c. An arrangement of five fascicles on each side of the tendon.
d. An arrangement in which the fascicles insert into the tendon from opposite sides. -
ANSWER d
A nursing infant develops a powerful sucking muscle that inserts to the muscle which
adults also use for whistling (orbicularis oris). What is this muscle called?
a. platysma
b. masseter
c. zygomaticus
d. buccinator - ANSWER d
What is the main factor that determines the power of a muscle?
a. the length
b. the shape
c. the number of neurons innervating it
d. the total number of muscle fibers (cells) available for contraction - ANSWER d
The ________ is known as the "boxer's muscle."
a. biceps brachii
b. flexor digitorum longus
c. serratus anterior
d. rectus abdominis - ANSWER c
What muscle is primarily responsible for preventing foot drop?
a. extensor digitorum longus
b. tibialis anterior
c. extensor hallucis longus
d. fibularis tertius - ANSWER b
Which of these is the function of the external oblique muscles?
Complete Solution
When a sarcomere contracts and thin filaments move over thick filaments you would
expect to see ________.
a. the I bands to appear smaller
b. the H zone to appear wider
c. the I bands to appear wider
d. the A band to appear darker - ANSWER a
Although there are no sarcomeres, smooth muscle still possesses thick and thin
filaments.
True
False - ANSWER true
Curare is a poisonous plant extract. Curare molecules have a chemical structure like
the neurotransmitter ACh. Curare can bind to the ACh receptor site on the chemically
gated ion channels in the motor end plate. Even though curare will bind to the receptor
site it will not open the ion channel and no ions will pass through. What do you think the
symptoms of curare poisoning would look like?
a. Muscles will respond too quickly and cause a severe tremor.
b. Curare will only affect cardiac muscle, causing fibrillations of the heart.
c. Curare will only affect muscles with ACh receptors, paralyzing them.
d. Smooth muscles will become stimulated causing quick movement of nutrients through
the digestive system. - ANSWER c
Which of the following is the correct sequence of events for muscle contractions?
a. motor neuron action potential, neurotransmitter release, muscle cell action potential,
release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
b. neurotransmitter release, muscle cell action potential, motor neuron action potential,
release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
c. muscle cell action potential, neurotransmitter release, ATP-driven power stroke,
calcium ion release from SR, sliding of myofilaments
,d. neurotransmitter release, motor neuron action potential, muscle cell action potential,
release of calcium ions from SR, ATP-driven power stroke - ANSWER a
Which of the following statements is true?
a. Cardiac muscle cells have many nuclei.
b. Smooth muscle cells have T tubules.
c. Striated muscle cells are long and cylindrical with many nuclei.
d. Cardiac muscle cells are found in the heart and large blood vessels. - ANSWER c
Hypothetically, if a muscle were stretched to the point where thick and thin filaments no
longer overlapped, ________.
a. cross bridge attachment would be optimum because of all the free binding sites on
actin
b. no muscle tension could be generated
c. maximum force production would result because the muscle has a maximum range of
travel
d. ATP consumption would increase because the sarcomere is "trying" to contract -
ANSWER b
Approximately 80% of a muscle fiber's volume are the myofibrils. This characteristic
reflects muscles ability to ________.
a. produce relatively high amounts of ATP
b. store oxygen molecules that can be used in aerobic respiration
c. produce movement through contractile force
d. generate and propagate action potential - ANSWER c
A potential benefit of recruiting slow oxidative fibers for contraction before recruiting
fast oxidative and fast glycolytic fibers might be ________.
a. to allow for fine control with delicate contractile force with a small stimulus
b. because they are slower to respond, slow oxidative fibers must be stimulated first in
order to contract simultaneously with the faster fibers
c. recruiting slow oxidative fibers early helps to tire them out first so that they won't
interfere with the more powerful contractions of fast glycolytic fibers
d. There is little to no benefit from recruiting slow oxidative fibers first, and therefore it
is in fact fast glycolytic fibers that will be recruited first. - ANSWER a
, Which of the following describes a bipennate pattern of fascicles?
a. An arrangement that looks like many feathers side by side.
b. An arrangement in which the fascicles insert into only one side of a tendon.
c. An arrangement of five fascicles on each side of the tendon.
d. An arrangement in which the fascicles insert into the tendon from opposite sides. -
ANSWER d
A nursing infant develops a powerful sucking muscle that inserts to the muscle which
adults also use for whistling (orbicularis oris). What is this muscle called?
a. platysma
b. masseter
c. zygomaticus
d. buccinator - ANSWER d
What is the main factor that determines the power of a muscle?
a. the length
b. the shape
c. the number of neurons innervating it
d. the total number of muscle fibers (cells) available for contraction - ANSWER d
The ________ is known as the "boxer's muscle."
a. biceps brachii
b. flexor digitorum longus
c. serratus anterior
d. rectus abdominis - ANSWER c
What muscle is primarily responsible for preventing foot drop?
a. extensor digitorum longus
b. tibialis anterior
c. extensor hallucis longus
d. fibularis tertius - ANSWER b
Which of these is the function of the external oblique muscles?
