Q. No.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.
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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