Straighterline Anatomy and Physiology 1 BIO201
Topic 9: Muscular System Histology and
Physiology Quiz 2023
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BIO201_MH_V3
Topic 9: Muscular System Histology and Physiology
Started on Saturday, June 10, 2023, 7:37 AM
State Finished
Completed on Saturday, June 10, 2023, 8:02 AM
Time taken 25 mins 24 secs
Grade 35.00 out of 35.00 (100%)
Question 1
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Which of the following is NOT a function of skeletal muscle?
Select one:
a. body movementb. maintenance of posture
c. Dilating and constricting the pupil of the eye
d. Carry out breathing movements
e. production of heat
Question 2
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Visceral smooth muscle
Select one:
a. may contain groups of cells that function as an independent unit.
b. occurs in sheets and exhibits numerous gap junctions.
c. contracts only when stimulated.
d. does not function as a unit.
e. All of these choices are correct.
Question 3
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Which type of muscle tissue possesses striations?
Select one:
a. skeletal muscle
b. smooth muscle
c. cardiac muscle
d. both skeletal and cardiac muscle
e. both cardiac and smooth muscle
Question 4Correct
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What type of muscle tissue has neuromuscular junctions?
Select one:
a. skeletal muscle
b. smooth muscle
c. cardiac muscle
Question 5
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Which type of muscle tissue would cause flexion and extension of the arm?
Select one:
a. skeletal muscle
b. smooth muscle
c. cardiac muscle
Question 6
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Which type of muscle tissue is multinucleated?
Select one:
a. skeletal muscleb. smooth muscle
c. cardiac muscle
d. both skeletal and cardiac muscle
e. both cardiac and smooth muscle
Question 7
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Why does muscle activity affect the temperature of the body?
Select one:
a. The rate of chemical reactions increases in muscle fibers during contraction, so the rate of heat
production also increases.
b. Muscle contraction generates pyrogens which reset the body's internal thermostat to a higher
temperature.
c. Muscle activity directs more warm blood to the muscles away from the central core causing a
cooling effect on your internal organs.
d. Increased muscle activity causes a rise in adipose stores which increases the insulation value of
the body.
Question 8
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As muscle activity increases, the body temperature _____.
Select one:
a. decreases
b. increase
Question 9
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The capacity of a muscle cell to shorten forcefully is known as
Select one:
a. contractility.
b. excitability.
c. extensibility.
d. elasticity.
e. flexibility.
Question 10
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Muscles exhibit the property of excitability. This means that the muscle
Select one:
a. shortens its length.
b. recoils to its original resting length.
c. stretches beyond its normal length.
d. responds to stimulation by the nervous system.
e. excites itself.
Question 11
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Question textWhat does "A" represent on the diagram?
Select one:
a. threshold
b. depolarization
c. depolarization phase of action potential
d. repolarization phase of action potential
Question 12
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Excitation-contraction coupling begins with:
Select one:
a. the depolarization of the transverse tubules
b. the production of an action potential in the sarcolemma
c. the release of calcium from the sarcoplasmic reticulum
d. the release of the cross-bridge
Question 13
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In order for muscle relaxation to occur,
Select one:
a. calcium ions must be transported to troponin.
b. power strokes slow down.
c. the active sites on actin must be blocked.d. sodium ions must be actively transported to troponin.
e. the active sites on myosin must be uncovered.
Question 14
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Which of the following is true?
Select one:
a. The greater the overlap of actin and myosin, the stronger the contraction.
b. Overstretching a muscle will increase its tension.
c. Optimal actin and myosin overlap will produce maximal contraction.
d. The greatest amount of tension is achieved when actin and myosin do not overlap.
e. Tension is great when actin and myosin overlap as much as they can.
Question 15
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When repolarization of the cell membrane is complete, the
Select one:
a. cell dies.
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.
Question 16
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The type of muscle fatigue known as "psychological fatigue" is the result of
Select one:
a. depleted ATP reserves.
b. increased calcium ion concentration in the sarcoplasm.
c. decreased levels of acetylcholine.
d. the emotional state of an individual.
e. None of these choices is correct.
Question 17
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Physiological contracture
Select one:
a. occurs when muscles are resting.
b. is a condition in which cross-bridges cannot release.
c. is caused by an abundance of ATP in muscle fibers.
d. results when muscles are well exercised.
e. results when the neurotransmitter remains in the receptor.
Question 18
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Anabolic steroids can do all of the following exceptSelect one:
a. increase muscle size and strength.
b. cause testicular atrophy.
c. cause cardiovascular disease.
d. increase the number of muscle fibers.
e. increase total muscle mass.
Question 19
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You are hired to work in a laboratory to measure the rate of human muscle contraction. Which of the
following might decrease in quantity in muscle cells undergoing contractions?
Select one:
a. ATP
b. carbon dioxide
c. water
d. lactic acid
e. sodium
Question 20
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Atrophy at the neuromuscular junction that naturally occurs with age would have what effect on
muscles?
Select one:
a. It would stimulate the nervous system to increase the speed in which it sends action potentials to
the myofiber.
b. It would stimulate muscle cramps.c. It would decrease the number of action potentials sent to the myofiber.
d. It would cause an increase in the amount of ACh released by the neurons to compensate.
e. It would have no effect on the muscles. [Show Less]