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| 1 | |
The ____________ collects blood from all other veins draining the myocardium and returns this blood to the right atrium. |
| | A) | great cardiac vein |
| | B) | left circumflex artery |
| | C) | posterior cardiac vein |
| | D) | coronary sinus |
| | E) | middle cardiac vein |
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| 2 | |
Which of the following is associated with the atria? |
| | A) | trabeculae carneae |
| | B) | pectinate muscles |
| | C) | chordae tendineae |
| | D) | papillary muscles |
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| 3 | |
Myocardial ischemia may cause |
| | A) | cardiac stenosis. |
| | B) | cardiac defibrillation. |
| | C) | angina pectoris. |
| | D) | cardiac arrest. |
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| 4 | |
Of the pathways listed, which correctly describes a route that blood can take in a normal human? |
| | A) | right atrium > pulmonary semilunar valve > right ventricle > tricuspid valve |
| | B) | tricuspid valve > right atrium > pulmonary semilunar valve > right ventricle |
| | C) | left atrium > bicuspid valve > left ventricle > aortic semilunar valve |
| | D) | right atrium > tricuspid valve > right ventricle > aortic semilunar valve |
| | E) | left atrium > tricuspid valve > left ventricle > pulmonary semilunar valve |
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| 5 | |
This chamber has to work harder than the others, so it has the thickest myocardium. |
| | A) | right ventricle |
| | B) | left ventricle |
| | C) | right atrium |
| | D) | left atrium |
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| 6 | |
The vessel just before the circumflex artery in normal circulation is the |
| | A) | anterior interventricular artery. |
| | B) | coronary sinus. |
| | C) | great cardiac vein. |
| | D) | left coronary artery. |
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| 7 | |
Which of the following structures allow one cardiac cell to electronically stimulate another by allowing ion flow across the intercalated disk? |
| | A) | fascia adherens |
| | B) | gap junctions |
| | C) | desmosomes |
| | D) | intercellular folds |
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| 8 | |
The most correct sequence in the cardiac conduction system is |
| | A) | SA node > AV bundle > AV node > bundle branches > Purkinje fibers. |
| | B) | AV bundle > SA node > AV node > bundle branches > Purkinje fibers. |
| | C) | Purkinje fibers > AV bundle > SA node > AV node > bundle branches. |
| | D) | SA node > AV node > AV bundle > bundle branches > Purkinje fibers. |
| | E) | AV bundle > AV node > bundle branches > SA node > Purkinje fibers. |
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| 9 | |
Which of the following is not one of the features of an intercalated disc? |
| | A) | Purkinje fibers |
| | B) | electrical junctions |
| | C) | mechanical junctions |
| | D) | interdigitating folds |
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| 10 | |
On the electrocardiogram, repolarization of the atria is represented by the |
| | A) | P wave. |
| | B) | QRS complex. |
| | C) | T wave. |
| | D) | PQ segment. |
| | E) | It does not appear on the EKG since it is obscured by the QRS complex. |
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| 11 | |
Which of the following statements is incorrect? |
| | A) | The firing of the SA node stimulates both atria to contract almost simultaneously. |
| | B) | The signal to contract is delayed at the AV node, allowing the ventricles to fill with blood. |
| | C) | Firing signals reach the papillary muscles before the rest of the ventricular myocardium. |
| | D) | Ventricular contraction begins at the AV valves and progresses downward toward the apex of the heart. |
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| 12 | |
A normal heartbeat of 70–80 beats per minute is referred to as |
| | A) | nodal rhythm. |
| | B) | sinus rhythm. |
| | C) | fibrillation. |
| | D) | heart block. |
| | E) | systolic rhythm. |
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| 13 | |
All of the following are cardiac stimulants except |
| | A) | epinephrine. |
| | B) | caffeine, nicotine, and chocolate. |
| | C) | thyroid hormone. |
| | D) | potassium and calcium ions. |
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| 14 | |
Unlike skeletal muscles, cardiac muscle has this feature. |
| | A) | larger cisternae |
| | B) | smaller T tubules |
| | C) | several nuclei |
| | D) | long, slender, unbranched cells |
| | E) | Calcium ions can come from ECF. |
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| 15 | |
Closure of the AV valves occurs when |
| | A) | the second heart sound is heard. |
| | B) | ventricular pressure exceeds atrial pressure. |
| | C) | atrial pressure exceeds ventricular pressure. |
| | D) | ventricular pressure and atrial pressure are equal. |
| | E) | blood is ejected from the ventricles. |
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| 16 | |
Which of the following is the correct sequence of events occurring in the cardiac cycle? |
| | A) | atrial systole, atrial diastole, ventricular systole, and ventricular diastole |
| | B) | atrial diastole, atrial systole, ventricular diastole, and ventricular systole |
| | C) | atrial systole, ventricular systole, atrial diastole, and ventricular diastole |
| | D) | atrial diastole, ventricular diastole, atrial systole, and ventricular systole |
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| 17 | |
During a normal cardiac cycle which phase has the longest duration? |
| | A) | atrial systole |
| | B) | ventricular systole |
| | C) | quiescent period |
| | D) | valvular period |
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| 18 | |
When the atria begin depolarizing, which of the following is occuring? |
| | A) | ventricular filling |
| | B) | ventricular ejection |
| | C) | atrial filling |
| | D) | atrial ejection |
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| 19 | |
If the time of ventricular filling were increased in duration |
| | A) | less blood would flow into the ventricles. |
| | B) | the end diastolic volume (EDV) would be greater. |
| | C) | the end systolic volume (ESV) would be greater. |
| | D) | the EDV and ESV would remain the same. |
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| 20 | |
An effectively three-chambered heart, as in septal defects, can lead to |
| | A) | mixing of oxygenated and deoxygenated blood. |
| | B) | surplus oxygen in the blood. |
| | C) | sinus venosus. |
| | D) | vein blockage. |
| | E) | double circulation. |
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