Q. No.Sympathetic stimulation would lead to:
1. increased heart rate.
2. increased stroke volume.
3. vasoconstriction in visceral blood vessels.
4. all of the above.
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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The semilunar valves will open during a normal cardiac cycle when the pressure in the left ventricle is
1. greater than the pressure in the aorta.
2. less than the pressure in the aorta.
3. the same as the pressure in the aorat.
4. less than the pressure in the left atrium.
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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The location of the human heart is most accurately described as:
| 1. | mediastinum of the lungs. |
| 2. | mediastinum of the pericardium. |
| 3. | mediastinum, which is located in the thoracic cavity. |
| 4. | thoracic cavity, which is located in the mediastinum. |
The right ventricle of the heart pumps blood into the:
| 1. | pulmonary circulation | 2. | systemic circulation |
| 3. | coronary circulation | 4. | portal circulation |
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What separates the atria from the ventricles so that the atrial impulse does not spill onto the ventricles?
| 1. | fibrous skeleton | 2. | AV bundle |
| 3. | visceral pericardium | 4. | Purkinje fibers |
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If the atrioventricular node is damaged:
1. SA node would not develop action potential
2. atria will fail to contract
3. the impulse will not reach AV node
4. the impulse will not reach ventricles
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The semilunar valves close at the beginning of
| 1. | atrial systole | 2. | atrial diastole |
| 3. | ventricular systole | 4. | ventricular diastole |
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