BIO202_MH_V3
Topic 2: Cardiovascular System: The Heart
Started on Thursday, October 21, 2021, 12:55 AM
State Finished
Completed on Thursday,
... [Show More] October 21, 2021, 1:18 AM
Time taken 22 mins 51 secs
Grade 40.00 out of 40.00 (100%)
Question 1
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Which of the following events occurs first?
Select one:
a. threshold
b. depolarization
c. early repolarization
d. final repolarization
e. pacemaker potential
Question 2
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Which of the following is a function of the heart skeleton?
Select one:
a. Provides electrical insulation between the atria and ventricles.
b. Supplies support and reinforcement for the valves.
c. Provides a rigid site for cardiac muscle attachment.
d. All of the choices are functions of the heart skeleton.
Question 3
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Excess potassium ions in cardiac tissue cause
Select one:
a. an increased heart rate.
b. a rapid repolarization of cardiac cells.
c. a decrease in the frequency of action potentials in the conduction system.
d. an increase in stroke volume.
e. an increase in the frequency of action potentials.
Question 4
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The delivery of oxygen and nutrients to the tissues of the body is accomplished through
________ circulation.
Select one:
a. hepatic
b. pulmonary
c. peripheral
d. systemic
Question 5
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Lowered extracellular potassium levels will lower the heart rate because
Select one:
a. the resting membrane potential is hyperpolarized.
b. ectopic action potentials occur.
c. action potential amplitude declines.
d. more sodium channels open.
e. it blocks calcium channels.
Question 6
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Which of the following is mismatched?
Select one:a. opening of sodium channels - depolarization
b. closing of calcium channels - plateau phase
c. opening of potassium channels - rapid repolarization
d. closure of sodium channels - early repolarization
e. opening of calcium channels - plateau phase
Question 7
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The heart
Select one:
a. is a four-chambered muscular pump.
b. is posterior to the trachea.
c. is lined with an epithelial layer called epicardium.
d. lies mostly to the right of the midline of the sternum.
e. has a superior apex and an inferior base.
Question 8
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Cardiac muscle cells
Select one:
a. have smooth ER but no T tubules.
b. form the heart valves.c. are maintained by an extensive capillary network.
d. develop a significant oxygen debt during systole.
e. do not contain actin and myosin like skeletal muscle cells.
Question 9
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Which of the following phrases would apply to cardiac muscle cells?
Select one:
a. are organized in parallel columns or bundles
b. contain actin but no myosin
c. develop a significant oxygen debt during systole
d. are multinucleated like skeletal muscle cells
e. possess special cell-to-cell contacts called intercalated discs
Question 10
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Small changes in _____________ will have a large impact on the heart's pumping
effectiveness, while large changes in ___________ do not impact the effectiveness much.
Select one:
a. afterload; preload
b. preload; afterload
c. contractility; preloadd. afterload; contractility
e. contractility; afterload
Question 11
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What abnormal heart rhythm could be caused by an elevated body temperature, excessive
sympathetic stimulation, or toxic conditions?
Select one:
a. bradycardia
b. atrial fibrillation
c. second-degree AV node block
d. tachycardia
Question 12
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Calcium channel blockers are frequently used to
Select one:
a. increase the heart rate.
b. treat tachycardia or other arrhythmias.
c. speed up conduction of impulses through the AV node.
d. slow the closing of potassium ion channels.
e. treat bradycardia and low blood pressure.
Question 13Correct
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Which of the following might increase the risk for cardiovascular disease?
Select one:
a. stopping smoking
b. exercise
c. maintaining normal cholesterol levels
d. chronic stress
e. lots of fiber in the diet
Question 14
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Aortic stenosis results from
Select one:
a. a hole in the interatrial septum.
b. a weakening of heart muscle.
c. a narrowed opening through the aortic valve.
d. low oxygen levels.
e. leakage from the AV valves.
Question 15
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Coronary artery disease can diminish myocardial blood flow resulting in the death of
myocardial cells. This condition is known as a myocardial
Select one:
a. attack.
b. angina.
c. necrosis.
d. cirrhosis.
e. infarction.
Question 16
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In the cardiac cycle,
Select one:
a. the right atrium and the right ventricle contract simultaneously.
b. the left atrium contracts before the right atrium.
c. all four chambers of the heart contract at the same time.
d. all four chambers of the heart are in diastole at the same time.
Question 17
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During hemorrhagic shock in which blood pressure is decreased, which of the regulatory
mechanisms is most important is increasing cardiac output to help maintain blood pressure?
Select one:
a. increased sympathetic stimulation of the heart
b. increase venous return
c. increase in parasympathetic stimulation of the heart
d. increase vagal stimulation of the heart
e. increase in the amplitude of the heart sounds
Question 18
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In the cardiac cycle,
Select one:
a. the right atrium and the right ventricle contract simultaneously.
b. the two atria relax while the two ventricles contract.
c. the left atrium contracts before the right atrium.
d. all four chambers of the heart contract at the same time.
e. all four chambers of the heart are in systole at the same time.
Question 19
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An incompetent pulmonary semilunar valve could result in less blood reaching the
Select one:
a. lungs.
b. heart muscle.
c. right ventricle.
d. aorta.
e. right atrium.
Question 20
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Variations in respiratory rate is a symptom of
Select one:
a. sinus arrhythmia.
b. ventricular tachycardia.
c. SA node block.
d. paroxysmal atrial tachycardia [Show Less]