EMT-B MIDTERM EXAM
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1. Deoxygenated blood from the body returns to the:
A. right atrium.
B. right ventricle.
C. left atrium.
D. left ventricle.: A. right atrium.
2. Blood that is ejected from the right ventricle:
A. enters the systemic circulation.
B. flows into the pulmonary arteries.
C. has a high concentration of oxygen.
D. was received directly from the aorta.: B. flows into the pulmonary arteries.
3. Which of the following blood vessels transports oxygenated blood?
A. superior vena cava
B. pulmonary arteries
C. inferior vena cava
D. pulmonary veins: D. pulmonary veins
4. What is the function of the left atrium?
A. It ejects oxygenated blood into the aorta.
B. It receives oxygenated blood from the lungs.
C. It receives blood from the pulmonary arteries.
D. It receives oxygenated blood from the vena cava.: B. It receives oxygenated
blood from the lungs.
5. The left ventricle has the thickest walls because it:
A. pumps blood to the lungs to be reoxygenated.
B. uses less oxygen than other chambers of the heart.
C. pumps blood into the aorta and systemic circulation.
D. receives blood directly from the systemic circulation.: C. pumps blood into
the aorta and systemic circulation.
6. The electrical impulse generated by the heart originates in the:
A. bundle of His.
B. coronary sinus.
C. sinoatrial (SA) node.
D. atrioventricular (AV) node.: C. sinoatrial (SA) node.
7. When an electrical impulse reaches the AV node, it is slowed for a brief
period of time so that:
A. blood can pass from the atria to the ventricles.
B. blood returning from the body can fill the atria.
C. the impulse can spread through the Purkinje fibers.
D. the SA node can reset and generate another impulse.: A. blood can pass from
the atria to the ventricles.
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8. The ability of cardiac muscle cells to contract spontaneously without a
stimulus from a nerve source is
called:
A. excitability.
B. contractility.
C. impulsivity.
D. automaticity.: D. automaticity.
9. The electrical stimulus that originates in the heart's primary pacemaker is
controlled by impulses from the
brain that arrive by way of the:
A. parietal lobe.
B. pons and medulla.
C. somatic nervous system.
D. autonomic nervous system.: D. autonomic nervous system.
10. Which of the following is NOT a function of the sympathetic nervous
system?
A. dilation of blood vessels in the muscles
B. constriction of blood vessels in the muscles
C. increases in the heart and respiratory rates
D. constriction of blood vessels in the digestive system: B. constriction of blood
vessels in the muscles
11. In contrast to the sympathetic nervous system, the parasympathetic ner-
vous system:
A. prepares the body to handle stress.
B. causes an increase in the heart rate.
C. slows the heart and respiratory rates.
D. dilates the blood vessels in the muscles.: C. slows the heart and respiratory
rates.
12. When the myocardium requires more oxygen:
A. the heart contracts with less force.
B. the arteries supplying the heart dilate.
C. the heart rate decreases significantly.
D. the AV node conducts fewer impulses.: B. the arteries supplying the heart
dilate.
13. The myocardium receives oxygenated blood from the __________, which
originate(s) from the
__________.
A. coronary sinus, vena cava
B. aorta, inferior vena cava
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C. vena cava, coronary veins
D. coronary arteries, aorta: D. coronary arteries, aorta
14. Which of the following would cause the greatest increase in cardiac out-
put?
A. increased heart rate and increased stroke volume
B. decreased stroke volume and increased heart rate
C. decreased heart rate and increased stroke volume
D. decreased stroke volume and decreased heart rate: A. increased heart rate
and increased stroke volume
15. The right coronary artery supplies blood to the:
A. left ventricle and inferior wall of the right atrium.
B. right ventricle and inferior wall of the left ventricle.
C. right atrium and posterior wall of the right ventricle.
D. left ventricle and posterior wall of the right ventricle.: B. right ventricle and
inferior wall of the left ventricle.
16. The head and brain receive their supply of oxygenated blood from the:
A. iliac arteries.
B. brachial arteries.
C. carotid arteries.
D. subclavian arteries.: C. carotid arteries.
17. The descending aorta divides into the two iliac arteries at the level of the:
A. nipple line.
B. umbilicus.
C. iliac crest.
D. pubic symphysis.: B. umbilicus.
18. Which of the following veins is located inferior to the trunk?
A. cephalic
B. axillary
C. saphenous
D. subclavian: C. saphenous
19. The iliac arteries immediately subdivide into the:
A. femoral arteries.
B. peroneal arteries.
C. anterior tibial arteries.
D. posterior tibial arteries.: A. femoral arteries.
20. The inferior vena cava returns deoxygenated blood to the right side of the
heart from all of the following
areas, EXCEPT the:
A. brain.
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B. kidneys.
C. abdomen.
D. legs.: A. brain.
21. Which of the following is the MOST reliable method of estimating a pa-
tient's cardiac output?
A. Listen to heart sounds with a stethoscope.
B. Connect the patient to an electrocardiogram.
C. Assess the heart rate and strength of the pulse.
D. Determine the average diastolic blood pressure.: C. Assess the heart rate and
strength of the pulse.
22. Cardiac output may decrease if the heart beats too rapidly because:
A. a rapid heart beat causes a decrease in the strength of cardiac contrac-
tions.
B. the volume of blood that returns to the heart is not sufficient with fast heart
rates.
C. as the heart rate increases, more blood is pumped from the ventricles than
the atria.
D. there is not enough time in between contractions for the heart to refill
completely.: D. there is not enough time in between contractions for the heart to
refill completely.
23. When afterload increases:
A. the volume of venous blood that returns to the right atrium increases.
B. the amount of resistance that the ventricle must beat against decreases.
C. it becomes harder for the ventricle to push blood through the blood ves-
sels.
D. the blood pressure falls because of significant dilation of the blood ves-
sels.: C. it becomes harder for the ventricle to push blood through the blood vessels.
24. The posterior tibial pulse can be palpated:
A. on the dorsum of the foot.
B. above the lateral malleolus.
C. in the fossa behind the knee.
D. behind the medial malleolus.: D. behind the medial malleolus.
25. Ischemic heart disease is MOST accurately defined as:
A. absent myocardial blood flow due to a blocked coronary artery.
B. decreased blood flow to one or more portions of the myocardium.
C. death of a portion of the heart muscle due to a decrease in oxygen.
D. decreased blood flow to the heart muscle due to coronary dilation.: B.
decreased blood flow to one or more portions of the myocardium.
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1. Deoxygenated blood from the body returns to the:
A. right atrium.
B. right ventricle.
C. left atrium.
D. left ventricle.: A. right atrium.
2. Blood that is ejected from the right ventricle:
A. enters the systemic circulation.
B. flows into the pulmonary arteries.
C. has a high concentration of oxygen.
D. was received directly from the aorta.: B. flows into the pulmonary arteries.
3. Which of the following blood vessels transports oxygenated blood?
A. superior vena cava
B. pulmonary arteries
C. inferior vena cava
D. pulmonary veins: D. pulmonary veins
4. What is the function of the left atrium?
A. It ejects oxygenated blood into the aorta.
B. It receives oxygenated blood from the lungs.
C. It receives blood from the pulmonary arteries.
D. It receives oxygenated blood from the vena cava.: B. It receives oxygenated
blood from the lungs.
5. The left ventricle has the thickest walls because it:
A. pumps blood to the lungs to be reoxygenated.
B. uses less oxygen than other chambers of the heart.
C. pumps blood into the aorta and systemic circulation.
D. receives blood directly from the systemic circulation.: C. pumps blood into
the aorta and systemic circulation.
6. The electrical impulse generated by the heart originates in the:
A. bundle of His.
B. coronary sinus.
C. sinoatrial (SA) node.
D. atrioventricular (AV) node.: C. sinoatrial (SA) node.
7. When an electrical impulse reaches the AV node, it is slowed for a brief
period of time so that:
A. blood can pass from the atria to the ventricles.
B. blood returning from the body can fill the atria.
C. the impulse can spread through the Purkinje fibers.
D. the SA node can reset and generate another impulse.: A. blood can pass from
the atria to the ventricles.
, EMT-B MIDTERM EXAM
Study online at https://quizlet.com/_eakplu
8. The ability of cardiac muscle cells to contract spontaneously without a
stimulus from a nerve source is
called:
A. excitability.
B. contractility.
C. impulsivity.
D. automaticity.: D. automaticity.
9. The electrical stimulus that originates in the heart's primary pacemaker is
controlled by impulses from the
brain that arrive by way of the:
A. parietal lobe.
B. pons and medulla.
C. somatic nervous system.
D. autonomic nervous system.: D. autonomic nervous system.
10. Which of the following is NOT a function of the sympathetic nervous
system?
A. dilation of blood vessels in the muscles
B. constriction of blood vessels in the muscles
C. increases in the heart and respiratory rates
D. constriction of blood vessels in the digestive system: B. constriction of blood
vessels in the muscles
11. In contrast to the sympathetic nervous system, the parasympathetic ner-
vous system:
A. prepares the body to handle stress.
B. causes an increase in the heart rate.
C. slows the heart and respiratory rates.
D. dilates the blood vessels in the muscles.: C. slows the heart and respiratory
rates.
12. When the myocardium requires more oxygen:
A. the heart contracts with less force.
B. the arteries supplying the heart dilate.
C. the heart rate decreases significantly.
D. the AV node conducts fewer impulses.: B. the arteries supplying the heart
dilate.
13. The myocardium receives oxygenated blood from the __________, which
originate(s) from the
__________.
A. coronary sinus, vena cava
B. aorta, inferior vena cava
, EMT-B MIDTERM EXAM
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C. vena cava, coronary veins
D. coronary arteries, aorta: D. coronary arteries, aorta
14. Which of the following would cause the greatest increase in cardiac out-
put?
A. increased heart rate and increased stroke volume
B. decreased stroke volume and increased heart rate
C. decreased heart rate and increased stroke volume
D. decreased stroke volume and decreased heart rate: A. increased heart rate
and increased stroke volume
15. The right coronary artery supplies blood to the:
A. left ventricle and inferior wall of the right atrium.
B. right ventricle and inferior wall of the left ventricle.
C. right atrium and posterior wall of the right ventricle.
D. left ventricle and posterior wall of the right ventricle.: B. right ventricle and
inferior wall of the left ventricle.
16. The head and brain receive their supply of oxygenated blood from the:
A. iliac arteries.
B. brachial arteries.
C. carotid arteries.
D. subclavian arteries.: C. carotid arteries.
17. The descending aorta divides into the two iliac arteries at the level of the:
A. nipple line.
B. umbilicus.
C. iliac crest.
D. pubic symphysis.: B. umbilicus.
18. Which of the following veins is located inferior to the trunk?
A. cephalic
B. axillary
C. saphenous
D. subclavian: C. saphenous
19. The iliac arteries immediately subdivide into the:
A. femoral arteries.
B. peroneal arteries.
C. anterior tibial arteries.
D. posterior tibial arteries.: A. femoral arteries.
20. The inferior vena cava returns deoxygenated blood to the right side of the
heart from all of the following
areas, EXCEPT the:
A. brain.
, EMT-B MIDTERM EXAM
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B. kidneys.
C. abdomen.
D. legs.: A. brain.
21. Which of the following is the MOST reliable method of estimating a pa-
tient's cardiac output?
A. Listen to heart sounds with a stethoscope.
B. Connect the patient to an electrocardiogram.
C. Assess the heart rate and strength of the pulse.
D. Determine the average diastolic blood pressure.: C. Assess the heart rate and
strength of the pulse.
22. Cardiac output may decrease if the heart beats too rapidly because:
A. a rapid heart beat causes a decrease in the strength of cardiac contrac-
tions.
B. the volume of blood that returns to the heart is not sufficient with fast heart
rates.
C. as the heart rate increases, more blood is pumped from the ventricles than
the atria.
D. there is not enough time in between contractions for the heart to refill
completely.: D. there is not enough time in between contractions for the heart to
refill completely.
23. When afterload increases:
A. the volume of venous blood that returns to the right atrium increases.
B. the amount of resistance that the ventricle must beat against decreases.
C. it becomes harder for the ventricle to push blood through the blood ves-
sels.
D. the blood pressure falls because of significant dilation of the blood ves-
sels.: C. it becomes harder for the ventricle to push blood through the blood vessels.
24. The posterior tibial pulse can be palpated:
A. on the dorsum of the foot.
B. above the lateral malleolus.
C. in the fossa behind the knee.
D. behind the medial malleolus.: D. behind the medial malleolus.
25. Ischemic heart disease is MOST accurately defined as:
A. absent myocardial blood flow due to a blocked coronary artery.
B. decreased blood flow to one or more portions of the myocardium.
C. death of a portion of the heart muscle due to a decrease in oxygen.
D. decreased blood flow to the heart muscle due to coronary dilation.: B.
decreased blood flow to one or more portions of the myocardium.
