Q. No.If due to some injury, the chordae tendineae of the tricuspid valve of the human heart are partially non-functional, what will be the immediate effect?
| 1. | The blood will tend to flow back into the left atrium |
| 2. | The flow of blood into the pulmonary artery will be reduced |
| 3. | The flow of blood into aorta will be slowed down |
| 4. | The pacemaker will stop working |
Given below are four statements (a-d) regarding human blood circulatory system:
| (a) | Arteries are thick-walled and have narrow lumen as compared to veins. |
| (b) | Angina is acute chest pain when the blood circulation to the brain is reduced. |
| (c) | Persons with blood group AB can donate blood to any person with any blood group under the ABO system. |
| (d) | Calcium ions play a very important role in blood clotting. |
Which two of the above statements are correct?
| 1. (a) and (b) | 2. (b) and (c) |
| 3. (c) and (d) | 4. (a) and (d) |
Match the following columns and select the correct option.
| Column I | Column II | ||
| (a) | Eosinophils | (i) | Immune response |
| (b) | Basophils | (ii) | Phagocytosis |
| (c) | Neutrophils | (iii) | Release histaminase, destructive enzymes |
| (d) | Lymphocytes | (iv) | Release granules containing histamine |
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (i) | (ii) | (iii) |
| 2. | (i) | (ii) | (iv) | (iii) |
| 3. | (ii) | (i) | (iii) | (iv) |
| 4. | (iii) | (iv) | (ii) | (i) |
At which point, the pulmonary artery is different from the pulmonary vein:
1. Its lumen is broad
2. Its wall is thick
3. It has valves
4. It does not possess endothelium
In humans, blood passes from the post-caval to the diastolic right atrium of heart due to
| 1. | Pressure difference between the post-caval and atrium |
| 2. | Pushing open of the venous valves |
| 3. | Suction pull |
| 4. | Stimulation of the sinoatrial node |
In which one of the following pairs the two items mean one and the same thing?
1. Malleus - anvil
2. SA node - pacemaker
3. Leucocytes - lymphocytes
4. Haemophilia - blood cancer
Which one of the following is a matching pair?
| 1. | Lubb-sharp closure of AV valves at the beginning of ventricular systole |
| 2. | Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole |
| 3. | Pulsation of the radial artery-valves in the blood vessels |
| 4. | Initiation of the heart beat - Purkinje fibers |
How do parasympathetic neural signals affect the working of the heart?
| 1. | Reduce both heart rate and cardiac output |
| 2. | Heart rate is increased without affecting the cardiac output |
| 3. | Both heart rate and cardiac output increase |
| 4. | Heart rate decreases but cardiac output increases |
Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
| 1. | Neutrophils | 2. | Basophils |
| 3. | Eosinophils | 4. | Monocytes |
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