Q. No.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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What is true for the blood Type O?
| 1. | It is universal donor because it has neither anti-A antibodies nor anti-B antibodies circulating in the plasma. |
| 2. | It is universal donor because it has neither antigen A nor antigen B on its RBCs. |
| 3. | It is universal recipient because it has neither anti-A antibodies nor anti-B antibodies circulating in the plasma. |
| 4. | It is universal recipient because it has neither antigen A nor antigen B on its RBCs. |
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Purkinje fibers are:
| 1. | Intrinsic neural fibers in the ventricles |
| 2. | Muscle fibers that interconnect SA node and AV node |
| 3. | Muscle fibers that are distributed in the ventricular musculature |
| 4. | Neural fibers that spread the impulse throughout the ventricular muscle mass |
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On a surface ECG, the end of ventricular systole is marked by:
| 1. | The end of the QRS complex |
| 2. | The beginning of T wave |
| 3. | The end of T wave |
| 4. | The beginning of P wave |
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