Q. No.All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
1.
SA node has the lowest rate of depolarisation
2.
SA node is the only component to generate the threshold potential.
3.
Only SA node can convey the action potential to the other
4.
SA node has the highest rate of depolarisation.
A specialised nodal tissue embedded in the lower corner of the right atrium, close to atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec.
This delay allows -
1. blood to enter aorta.
2. the ventricles to empty completely.
3. blood to enter pulmonary arteries.
4. the atria to empty completely.
Match the Column I and Column II:
| Column I | Column II | ||
| (a) | P-waves | (i) | Depolarisation of ventricles |
| (b) | QRS complex | (ii) | Repolarisation of ventricles |
| (c) | T-wave | (iii) | Coronary ischemia |
| (d) | Reduction in the size of T-wave | (iv) | Depolarisation of atria |
| (v) | Repolarisation of atria |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (iii) | (v) | (iv) |
| 2. | (iv) | (i) | (ii) | (iii) |
| 3. | (iv) | (i) | (ii) | (v) |
| 4. | (ii) | (i) | (v) | (iii) |
Examination of the blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following, is likely to alleviate his symptoms?
1. Thiamine
2. Folic acid and cobalamine
3. Riboflavin
4. Iron compounds
A drop of each of the following is placed separately on four slides. Which of them will not coagulate?
| 1. | blood plasma |
| 2. | blood serum |
| 3. | Sample from the thoracic duct of the lymphatic system |
| 4. | Whole blood from the pulmonary vein |
If you suspect a major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
1. Serum albumins
2. Serum globulins
3. Fibrinogen in the plasma
4. Haemocytes
In humans, blood passes from the post caval to the diastolic right atrium of heart due to:
1. pushing open of the venous valves
2. suction pull
3. stimulation of the sino auricular node
4. pressure difference between the caval and atrium
Which one of the following mammalian cells is not capable of metabolizing glucose to carbon dioxide aerobically?
1. White blood cells
2. Unsatiated muscle cells
3. Liver cells
4. Red blood cells
| 1. | neutrophils and eosinophils |
| 2. | lymphocytes and macrophages |
| 3. | eosinophils and lymphocytes |
| 4. | neutrophils and monocytes |
1. Neutrophils
2. Basophils
3. Eosinophils
4. Monocytes
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