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Q. No.Arteries are best defined as the vessels which
1. carry blood away from the heart to different organs
2. break up into capillaries which reunite to form a vein
3. carry blood from one visceral organ to another visceral organ
4. supply oxygenated blood to the different organs
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
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| I: | SA node is the natural pacemaker of the human heart. |
| II: | SA node is the only part of that nodal musculature that is auto-excitable. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Pericardial fluid is the serous fluid secreted by the serous layer of the pericardium into the pericardial cavity and it serves to:
1. reduce friction between the pericardial membranes.
2. lubricate the heart valves.
3. replace any blood that is lost.
4. provide oxygen and nutrients to the endocardium.
Match the items given in Column I with those in Column II and select the correct option given below:
| Column I | Column II | ||
| a. | Tricuspid valve | (i) | Between left atrium and left ventricle |
| b. | Bicuspid valve | (ii) | Between right ventricle and pulmonary artery |
| c. | Semilunar valve | (iii) | Between right atrium and right ventricle |
| a | b | c | |
| 1. | iii | i | ii |
| 2. | i | iii | ii |
| 3. | i | ii | iii |
| 4. | ii | i | iii |
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What is the function of valves in the vascular system?
1. They allow blood flow away from the heart and limit high blood pressure in tissues
2. They allow blood flow to those capillary beds that need the blood at that moment
3. They allow blood flow towards the heart in veins that lack significant blood pressure
4. They allow blood flow to the lungs when the blood lacks enough oxygen
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
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| Assertion (A): | The sino-atrial node is normally the pacemaker of the human heart. |
| Reason (R): | It is the only auto-excitable part of the nodal tissue of the human heart. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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Q. No.
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