Q. No.The inter-atrial septum in the human heart can be best described as:
1. A thin muscular wall
2. A thick muscular wall
3. A thin fibrous tissue
4. A thick fibrous tissue
The opening between the right atrium and the right ventricle is guarded by the valve named
(1) bicuspid valve
(2) tricuspid valve
(3) mitral valve
(4) semilunar valve
Consider the following statement with respect to heart:
(i) It has the double walled membranous bag.
(ii) Human heart has four chambers: two larger atria and two median ventricles.
(iii) Human heart is mesodermal in origin and is situated in abdominal cavity.
(iv) There is no clear separation between atria and ventricles.
How many of the statements given above are correct?
(1) 2
(2) 3
(3) 1
(4) all are wrong
Which one is incorrect in the following:
(1) Inter atrial septa – thin and muscular
(2) Atrio– ventricular septa – thick and fibrous
(3) Inter ventricular septa – thick and muscular
(4) Pericardium – muscular
Semilunar valves are found between
1. left ventricle and aorta
2. right ventricle and pulmonary artery
3. left ventricle and pulmonary vein
4. both (1) and (2)
Bicuspid valves are present between
(1) left atria and aorta
(2) right atria and pulmonary artery
(3) left atria and left ventricle
(4) right atria and right ventricle
The sino-atrial node is the normal pacemaker of the human heart because:
| 1. | It is located in the right atrium. |
| 2. | It is the only part of the conducting system that can generate impulse. |
| 3. | It can generate the maximum number of action potentials in the conducting system. |
| 4. | It produces action potentials that are more in size than the other parts of the conducting system. |
SAN is present in __________ while AVN is present in __________.
(1) Right upper corner and left lower corner of both the atria.
(2) Right upper corner and left lower corner of right atrium.
(3) Right upper corner and left lower corner of left atrium.
(4) Right upper corner and left median corner of left atrium
A patch of nodal tissue responsible for initiating the rhythmic contractile activity of the heart is present in:
1. Lower left corner of the left ventricle
2. Upper right corner of the right atrium
3. Lower left corner of the right ventricle
4. Upper left corner of the left atrium
Match the following nodal tissues of heart with their correct location
| Column I | Column II | ||
| (a) | AV node | (i) | Right upper corner of the right atrium |
| (b) | SA node | (ii) | Left upper corner of the right atrium |
| (c) | Bundle branch | (iii) | Base of inter atrial septum tilled towards right |
| (d) | Purkinje fibres | (iv) | Lower right corner of the right atrium |
| (v) | Interventrivular septum | ||
| (vi) | Musculature of ventricles | ||
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iii) | (ii) | (vi) | (v) |
| 2. | (iii) | (i) | (v) | (vi) |
| 3. | (i) | (iii) | (v) | (vi) |
| 4. | (v) | (iv) | (vi) | (iii) |
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