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1. An isotonic contraction is described as b. a muscle pro-
Select one: duces constant
tension during
a. action potential frequency is high enough that no contraction.
relaxation of muscle fibers occurs.
b. a muscle produces constant tension during con-
traction.
c. a muscle produces an increasing tension during
contraction.
d. a muscle produces increasing tension as it short-
ens.
e. a muscle produces tension, but the length of the
muscle is increasing
2. After contraction has occurred, the calcium is d. released from
Select one: troponin.
a. destroyed by cholinesterase.
b. chemically bound to the cross bridges.
c. secreted by the Golgi apparatus to the outside of
the cell.
d. released from troponin.
e. returned to the sarcolemma.
3. Increased strength of a trained muscle is due to b. the nervous sys-
Select one: tem's ability to re-
cruit a large num-
a. an increased number of muscle fibers. ber of motor units
b. the nervous system's ability to recruit a large num- simultaneously.
ber of motor units simultaneously.
c. elimination of unnecessary enzymes and metabolic
pathways.
d. elimination of all fat deposits.
e. elimination of unnecessary connective tissue.
4. Skeletal muscle fibers a. possess stria-
Select one: tions.
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a. possess striations.
b. can contract but are not extensible or excitable.
c. do not require nerve innervation to contract.
d. increase dramatically in number after birth.
e. are found in the walls of the stomach.
5. Which of the following correctly describes myoglo- c. acts as a reser-
bin's special function in muscle tissue? voir for oxygen
Select one:
a. breaks down glycogen
b. synthesizes ATP
c. acts as a reservoir for oxygen
d. produces action potentials
e. stores glucose
6. The outside of the resting plasma membrane is a. positively
__________ relative to the inside of the resting plas- charged
ma membrane.
Select one:
a. positively charged
b. negatively charged
c. electrically neutral
d. recharged
e. None of these choices is correct.
7. Fascia a. surrounds indi-
Select one: vidual muscles.
a. surrounds individual muscles.
b. separates muscle fibers.
c. connects muscles to bone.
d. is a type of muscle tissue.
e. is a type of nerve tissue.
8. When repolarization of the cell membrane is com-
plete, the
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Select one: e. original polarity
of the cell is re-
a. cell dies. stored.
b. cell regenerates.
c. cell no longer has a potential difference across its
membrane.
d. cell is no longer responsive.
e. original polarity of the cell is restored.
9. Which of the following actions is caused by contrac- b. moving your feet
tion of skeletal muscle? in walking
Select one:
a. contraction of the heart
b. moving your feet in walking
c. movement of food through the digestive tract
d. emptying of the urinary bladder
e. vasoconstriction
10. What is smooth muscle tone? c. relatively con-
Select one: stant tension
maintained for a
a. can rapidly develop action potentials period of time
b. shallow invaginations of cell membrane
c. relatively constant tension maintained for a period
of time
d. intracellular cytoskeleton
e. enzyme that removes phosphate from myosin
11. The sites where a chemical substance is transmitted a. neuromuscular
from the presynaptic terminal of an axon to the post- junctions.
synaptic membrane of a muscle fiber are called
Select one:
a. neuromuscular junctions.
b. sarcomeres.
c. myofilaments.
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d. Z disks.
e. cell body of neuron.
12. List the following structures in order from smallest to d. 2, 3, 1, 4
largest.
(1) muscle fiber
(2) myofilament
(3) myofibril
(4) muscle fasciculus
Select one:
a. 4, 2, 3, 1
b. 2, 1, 4, 3
c. 3, 1, 4, 2
d. 2, 3, 1, 4
e. 1, 2, 3, 4
13. Which of the following is NOT true of muscular atro- a. It is irreversible.
phy?
Select one:
a. It is irreversible.
b. It can be caused by disuse.
c. It can be caused by denervation.
d. Transcutaneous stimulation can help prevent it.
e. Muscle fibers are replaced by connective tissue.
14. Myosin phosphatase c. removes
Select one: phosphate from
myosin.
a. activates myosin kinase.
b. forms the cross-bridge.
c. removes phosphate from myosin.
d. binds to calcium-calmodulin complex.
e. opens calcium channels.
15. a. skeletal muscle
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1. An isotonic contraction is described as b. a muscle pro-
Select one: duces constant
tension during
a. action potential frequency is high enough that no contraction.
relaxation of muscle fibers occurs.
b. a muscle produces constant tension during con-
traction.
c. a muscle produces an increasing tension during
contraction.
d. a muscle produces increasing tension as it short-
ens.
e. a muscle produces tension, but the length of the
muscle is increasing
2. After contraction has occurred, the calcium is d. released from
Select one: troponin.
a. destroyed by cholinesterase.
b. chemically bound to the cross bridges.
c. secreted by the Golgi apparatus to the outside of
the cell.
d. released from troponin.
e. returned to the sarcolemma.
3. Increased strength of a trained muscle is due to b. the nervous sys-
Select one: tem's ability to re-
cruit a large num-
a. an increased number of muscle fibers. ber of motor units
b. the nervous system's ability to recruit a large num- simultaneously.
ber of motor units simultaneously.
c. elimination of unnecessary enzymes and metabolic
pathways.
d. elimination of all fat deposits.
e. elimination of unnecessary connective tissue.
4. Skeletal muscle fibers a. possess stria-
Select one: tions.
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a. possess striations.
b. can contract but are not extensible or excitable.
c. do not require nerve innervation to contract.
d. increase dramatically in number after birth.
e. are found in the walls of the stomach.
5. Which of the following correctly describes myoglo- c. acts as a reser-
bin's special function in muscle tissue? voir for oxygen
Select one:
a. breaks down glycogen
b. synthesizes ATP
c. acts as a reservoir for oxygen
d. produces action potentials
e. stores glucose
6. The outside of the resting plasma membrane is a. positively
__________ relative to the inside of the resting plas- charged
ma membrane.
Select one:
a. positively charged
b. negatively charged
c. electrically neutral
d. recharged
e. None of these choices is correct.
7. Fascia a. surrounds indi-
Select one: vidual muscles.
a. surrounds individual muscles.
b. separates muscle fibers.
c. connects muscles to bone.
d. is a type of muscle tissue.
e. is a type of nerve tissue.
8. When repolarization of the cell membrane is com-
plete, the
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Select one: e. original polarity
of the cell is re-
a. cell dies. stored.
b. cell regenerates.
c. cell no longer has a potential difference across its
membrane.
d. cell is no longer responsive.
e. original polarity of the cell is restored.
9. Which of the following actions is caused by contrac- b. moving your feet
tion of skeletal muscle? in walking
Select one:
a. contraction of the heart
b. moving your feet in walking
c. movement of food through the digestive tract
d. emptying of the urinary bladder
e. vasoconstriction
10. What is smooth muscle tone? c. relatively con-
Select one: stant tension
maintained for a
a. can rapidly develop action potentials period of time
b. shallow invaginations of cell membrane
c. relatively constant tension maintained for a period
of time
d. intracellular cytoskeleton
e. enzyme that removes phosphate from myosin
11. The sites where a chemical substance is transmitted a. neuromuscular
from the presynaptic terminal of an axon to the post- junctions.
synaptic membrane of a muscle fiber are called
Select one:
a. neuromuscular junctions.
b. sarcomeres.
c. myofilaments.
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d. Z disks.
e. cell body of neuron.
12. List the following structures in order from smallest to d. 2, 3, 1, 4
largest.
(1) muscle fiber
(2) myofilament
(3) myofibril
(4) muscle fasciculus
Select one:
a. 4, 2, 3, 1
b. 2, 1, 4, 3
c. 3, 1, 4, 2
d. 2, 3, 1, 4
e. 1, 2, 3, 4
13. Which of the following is NOT true of muscular atro- a. It is irreversible.
phy?
Select one:
a. It is irreversible.
b. It can be caused by disuse.
c. It can be caused by denervation.
d. Transcutaneous stimulation can help prevent it.
e. Muscle fibers are replaced by connective tissue.
14. Myosin phosphatase c. removes
Select one: phosphate from
myosin.
a. activates myosin kinase.
b. forms the cross-bridge.
c. removes phosphate from myosin.
d. binds to calcium-calmodulin complex.
e. opens calcium channels.
15. a. skeletal muscle
