Q. No.The average life span of human red blood cells is:
1. 10 days
2. 120 days
3. 21 days
4. three months
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In the early fetal life the main site for red blood cell formation is:
1. bone marrow
2. kidney
3. liver
4. spleen
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 |
A chest pain or pressure, usually due to not enough blood flow to the heart muscle, is known as:
| 1. hypoxia | 2. infarction |
| 3. angina | 4. diaphoresis |
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What is the percentage of atrial blood that flows into the ventricles without atrial systole?
| 1. | 90 | 2. | 70 |
| 3. | 50 | 4. | 30 |
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Atria can completely empty during ventricular filling due to:
1. A-V node
2. A-V bundle
3. S-A node
4. Purkinje fibers
The period that extends from the onset of atrial depolarization until the onset of ventricular depolarization is shown in an ECG as:
1. QRS complex
2. S-T interval
3. P-Q interval
4. QRS-T interval
The arrhythmia that results in cardiac arrest followed by death in the absence of treatment and therefore considered most serious is:
1. Tachycardia
2. Sinus bradycardia
3. Atrial flutter
4. Ventricular fibrillation
The venous return to the heart is facilitated by:
1. valves
2. inspiration
3. skeletal muscle
4. all of these
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