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Which of the following makes up the bulk of the wall of the heart?

a. epicardium

b. endocardium

c. pericardium

d. myocardium

Question 2

Which of the following statements correctly describes the ventricles?

  1. a.the ventricles are the pumping chambers of the heart
  2. b.the ventricles have thinner walls than the atria
  3. c.the right ventricle pumps blood out to body tissues while the left ventricle pumps blood out to the lungs
  4. d.the blood in the left ventricle is deoxygenated while that in the right is oxygenated
  5. e.both a and c are correct

5 points 

Question 3

Which of the following has the fastest rate of depolarization?

  1. a.AV node
  2. b.bundle branches
  3. c.SA node
  4. d.Purkinje fibers

5 points 

Question 4

Which of the following is true of the mitral valve?

  1. a.composed of three cusps
  2. forced shut as a result of increasing pressure in the left ventricle
  3. c.opens in synchrony with the aortic semilunar valve (i.e., both open together)
  4. d. a, b and c all are correct

5 points 

Question 5

The ductus arteriosus 

  1. a fetal structure that shunts blood away from the pulmonary circuit
  2. b. is located between the the pulmonary trunk and the aorta
  3. c.closes at birth 
  4. d.a, b and c all are correct

5 points 

Question 6

If an individual has an incompetent aortic valve one would expect to see

  1. a.excess blood accumulating in the right ventricle
  2. b.backflow of blood into the left ventricle during ventricular diastole
  3. c.increased right ventricular stroke volume
  4. d.backflow of blood into the right atrium during ventricular systole

5 points 

Question 7

If there is a blockage in the anterior interventricular artery, which area of the heart would be most adversely affected?

  1. a.anterior right ventricle
  2. b.posterior left ventricle
  3. c.anterior right atrium
  4. d.anterior walls of both ventricles

5 points 

Question 8

During the cardiac cycle

  1. a.most blood enters the ventricles during atrial systole
  2. b.approximately 60% of the blood in a ventricle is ejected
  3. c.atrial and ventricular systole occur simultaneoiusly
  4. d.a, b and c all are correct

5 points 

Question 9

The ventricles are filled with blood and ready to contract. The volume of blood in the ventricles at this time is referred to as:

  1. a.end systolic volume
  2. b.end diastolic volume
  3. c.stroke volume
  4. d.cardiac output

5 points 

Question 10

All of the following have a positive ionotropic effect except

  1. a.stimulation of the sympathetic branch of the autonomic nervous system
  2. b.moderate increases in extracellular Ca++
  3. c.acidosis
  4. d.drugs such as digitalis

5 points 

Question 11

Which of the following is true of cardiac muscle but not skeletal muscle:?

  1. striated
  2. voluntary
  3. c.cells are connected to one another by intercalated discs
  4. d.require Ca++ for contraction

5 points 

Question 12

All of the following empty into the right atrium except

  1. a.coronary sinus
  2. b.superior vena cava
  3. c.right superior pulmonary vein
  4. d.inferior vena cava

5 points 

Question 13

Which of the following structures would contain blood with the least amount of oxygen?

  1. a.left atrium
  2. b.pulmonary veins
  3. c.coronary sinus
  4. d.b and c both are correct

5 points 

Question 14

Which functions as the electrical connection between the atria and ventricles?

  1. a.SA node
  2. b.Purkinje fibers
  3. c.AV bundle
  4. d.AV node

5 points 

Question 15

Heart sounds associated with AV valves closing occur at:

  1. a.start of systole
  2. b.end of isovolumetric relaxation
  3. c.start of ventricular systole
  4. d.start of ventricular diastole

5 points 

Question 16

Which phase of the cardiac cycle comes after isovolumetric contraction?

  1. a.isovolumetric relaxatioin
  2. b.ventricular ejection
  3. c.ventricular ejection

5 points 

Question 17

Sympathetic stimulation of the heart primarily increases stroke volume by increasing:

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