Q. No.
Rate of heartbeat is determined by:
1. Purkinje fibres
2. papillary muscles
3. SA-node
4. AV-node
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) |
What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
1. 125 beats per minute
2. 50 beats per minute
3. 75 beats per minute
4. 100 beats per minute
Assertion: Right atrium and right ventricle of heart are known as pulmonary heart.
Reason: Both right atrium and ventricle pump the deoxygenated blood.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Aging RBCs are phagocytized by macrophages in the mononuclear phagocyte system [sleen or liver] and their components are recycled, EXCEPT for the
1. iron atom from the heme group, which is excreted in bile
2. globin peptide chains, which are sent to the kidneys for excretion
3. globin peptide chains, which are converted into bilirubin
4. heme group (minus the iron atom), which is converted into a green pigment called biliverdin
The normal pacemaker of the human heart, sinoatrial node, is derived from the more primitive:
1. ventricle
2. bundle of His
3. conus arteriosus
4. sinus venosus
Amongst the following, a molecule that would lead to coagulation of the blood would be:
1. prostacyclin
2. tissue factor or thromboplastin
3. plasmin
4. tissue plasminogen activator
During a cardiac cycle:
1. About 70 ml of blood is pumped by the two ventricles
2. The left atrium and the left ventricle contract simultaneously
3. More blood is pumped into the systemic than in pulmonary circulation
4. The atria contract prior to the ventricles
Erythroblastosis fetalis can be prevented during a second pregnancy in a Rh negative mother who is likely to carry a Rh positive fetus by:
| 1. | Administering anti – Rh antibodies to the mother just before the delivery of the second child |
| 2. | Administering Rh antigen to the mother just after the delivery of the first child |
| 3. | Administering Rh antigen to the mother just before the delivery of the second child |
| 4. | Administering anti – Rh antibodies to the mother just after the delivery of the first child |
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