QRS complexes on the ECG tracings show that:
1. The atria are depolarizing.
2. The ventricles are depolarizing.
3. The ventricles are repolarizing.
4. The heart is at rest.
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Pulmonary veins return the oxygenated blood from the lungs to:
1. | right atrium | 2. | left atrium |
3. | right ventricle | 4. | left ventricle |
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Erythrocytes in humans are destroyed mainly in:
1. | liver and spleen | 2. | heart and lungs |
3. | bone marrow | 4. | kidney |
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The most common WBC under normal physiological conditions are:
1. Neutrophils | 2. Macrophages |
3. Monocytes | 4. Lymphocytes |
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The chamber with the thickest musculature in the human heart would be:
1. the right atrium | 2. the left atrium |
3. the left ventricle | 4. the right ventricle |
Sympathetic stimulation would lead to:
1. increased heart rate.
2. increased stroke volume.
3. vasoconstriction in visceral blood vessels.
4. all of the above.
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The innermost layer of blood vessel walls made up of one layer of endothelium and in direct contact with the blood is:
1. tunica adventitia | 2. tunica intima |
3. tunica media | 4. tunica muscularis |
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The build-up of fats, cholesterol and other substances in and on the artery walls is known as:
1. | arteriosclerosis | 2. | atherosclerosis |
3. | aneurysm | 4. | anastomosis |
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Cardiac output is defined as
1. blood pressure X stroke volume.
2. peripheral resistance X heart rate.
3. heart rate X stroke volume.
4. Systolic pressure – diastolic pressure.
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A person has a complete blood count done. Which of the following would not be normal?
1. total RBC count - 5.0 million /µL
2. total WBC count – 1500 /µL
3. total platelet count - 225,000 /µL
4. hemoglobin – 14.5 g / 100 ml
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