Biomed 100 Practice Quiz
Chapter 13, Fall 2007

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1. True or false? The "myocardium" is the thickest layer of the heart wall.
   1. True.
   2. False.
   
   
2. What is the function of "Purkinje fibers?"
   1. carry oxygenated blood into ventricular myocardium
   2. carry electricity from sinoatrial node to atrioventricular node
   3. carry electricity into ventricular myocardium
   4. pull flaps of semilunar valves to help control valve function
   
   
3. The superior vena cava and inferior vena cava carry _?_ blood into the _?_.
   1. oxygenated / right atrium
   2. deoxygenated / right atrium
   3. oxygenated / left atrium
   4. deoxygenated / left atrium
   
   
4. Which one of the following is not one of the three (3) largest arteries in the body?
   1. aorta
   2. pulmonary trunk
   3. left coronary artery
   
   
5. Which statement is true?
   1. Both atria receive blood from veins and both ventricles pump blood into arteries.
   2. Both atria contain deoxygenated blood and both ventricles contain oxygenated blood.
   3. Both atria contract together and both ventricles contract together.
   4. Both A. and B.
   5. Both A. and C.
   
   
6. Which one of the following is false?
   1. During ventricular systole, valves prevent blood flow into atria.
   2. During ventricular diastole, valves prevent blood flow from atria to ventricles.
   3. During ventricular diastole, valves prevent blood flow from arteries to ventricles.
   
   
7. The most direct causes of the first heart sound (S1) and second heart sound (S2) are
   1. contraction of atria followed by contraction of ventricles
   2. opening of one pair of valves at beginning of systole followed by opening of another pair of valves at end of systole
   3. closing of one pair of valves at beginning of systole followed by closing of another pair of valves at end of systole
   4. opening of one pair of valves at beginning of systole followed by closing of the same pair at end of systole
   
   
8. True or false? In a normal heart, the atrioventricular node (AV node) functions as the "natural pacemaker."
   1. True.
   2. False.
   
   
9. Following release of electrical energy from the atrioventricular node (AV node),
   1. current spreads directly into the atria only.
   2. current spreads directly into the ventricles only.
   3. current passes through a conductive "bundle" and pair of "bundle branches" in order to reach the sinoatrial node (SA node).
   4. current passes through a conductive "bundle" and pair of "bundle branches" in order to reach the ventricular myocardium.
   
   
10. Gases and other substances pass most easily through the walls of
    1. all systemic vessels
    2. all pulmonary vessels
    3. pulmonary arteries and systemic veins
    4. all capillaries
    
    
11. The _?_ receive(s) oxygenated blood from the aorta and deliver(s) it to the myocardium.
    1. pulmonary arteries
    2. coronary arteries
    3. coronary sinus
    4. sinoatrial and atrioventricular nodes
    
    
12. Which one of the following is the most common or normal?
    1. the ventricles spend approximately 0.3 second in systole and 0.3 second in diastole.
    2. the ventricles spend approximately 0.3 second in systole and 0.5 second in diastole.
    3. the ventricles spend approximately 0.5 second in systole and 0.3 second in diastole.
    4. the ventricles spend approximately 0.5 second in systole and 0.5 second in diastole.