Q. No.
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What is the function of valves in the vascular system?
1. They allow blood flow away from the heart and limit high blood pressure in tissues
2. They allow blood flow to those capillary beds that need the blood at that moment
3. They allow blood flow towards the heart in veins that lack significant blood pressure
4. They allow blood flow to the lungs when the blood lacks enough oxygen
What is the average duration of diastole and systole in a cardiac cycle lasting 0.8 seconds?
1. 0.3 seconds; 0.5 seconds
2. 0.4 seconds; 0.4 seconds
3. 0.5 seconds; 0.3 seconds
4. 0.6 seconds; 0.2 seconds
What is true regarding pulmonic and aortic semilunar valves in the human heart?
1. They prevent the backflow of blood from the ventricles into the atria
2. They are open during the relaxation phase of the ventricles
3. They are held tightly closed by papillary muscles and chordae tendineae
4. They regulate the passage of blood from the ventricles into the pulmonary artery and the aorta
Which of the following causes the second heart sound [dub]?
1. opening of the AV valves at the start of diastole
2. closing of the AV valves at the start of systole
3. opening of the semilunar valves at the start of systole
4. closing of the semilunar valves at the start of diastole
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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Tissue death (necrosis) due to inadequate blood supply to the affected area, such as the heart, is:
| 1. coronary thrombosis | 2. angina pectoris |
| 3. ischemia | 4. infarction |
The deficiency of cynocobalamin or vitamin B12 causes:
| 1. aplastic anemia | 2. pernicious anemia |
| 3. hemolytic anemia | 4. hemorrhagic anemia |
The volume of blood being pumped by the heart, in particular by the left or right ventricle, per unit time is called as:
| 1. stroke volume | 2. end-diastolic volume |
| 3. ejection fraction | 4. cardiac output |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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Capillary walls are different from the walls of veins and arteries as they are composed of:
1. endothelium only.
2. endothelium and smooth muscle.
3. a tunica interna and a tunica media.
4. smooth muscle and elastic connective tissue.
Electrical relay station, slowing the electrical current sent by the sinoatrial (SA) node before the signal is permitted to pass down through to the ventricles, is/are:
| 1. bundle branches | 2. Purkinje fibers |
| 3. AV node | 4. AV bundle |
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