Q. No.
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of
| 1. | Purkinje system |
| 2. | Sinoatrial node |
| 3. | Atrioventricular node |
| 4. | Atrioventricular bundle |
The most active phagocytic white blood cells are
| 1. | Neutrophils and monocytes |
| 2. | Neutrophils and eosinophils |
| 3. | Lymphocytes and macrophages |
| 4. | Eosinophils and lymphocytes |
All vertebrates posses a:
| 1. muscular chambered heart | 2. renal portal system |
| 3. nucleated RBC | 4. double circulation |
With the help of ECG tracings, the heart rate of the person can be calculated by:
| 1. | measuring the size of the PR or PQ interval |
| 2. | counting the number of QRS complexes in a given period of time |
| 3. | counting the number of T waves between two successive QRS complexes |
| 4. | measuring the size of the QRS complexes |
If the left ventricle fails to pump blood adequately to the body’s cells, it usually leads to:
| 1. heart block | 2. cardiac tamponade |
| 3. congestive heart failure | 4. cardiac arrest |
The first heart sound is produced when
| 1. | Semilunar valve shuts |
| 2. | Interventricular pressure decrease |
| 3. | Diastole begins |
| 4. | Bicuspid and tricuspid valves closed quickly |
The deposition of lipids on the wall lining the lumen of large and medium sized arteries is referred to as:
| 1. | Deep vein thrombosis |
| 2. | Stokes- Adams syndrome |
| 3. | Osteoporosis |
| 4. | Atherosclerosis |
Coronary heart disease is due to:
| 1. | Streptococci bacteria |
| 2. | Inflammation of pericardium |
| 3. | Weakening of the heart valves |
| 4. | Insufficient blood supply to the heart muscles |
People living at sea level have around 5 million RBCs per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude
| 1. | People eat more nutritive food, therefore, more RBCs are formed. |
| 2. | People get pollution-free air to breathe and more oxygen is available |
| 3. | Atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive. |
| 4. | There is more UV radiation which enhance RBC production. |
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