The thick muscular projections on the walls of the ventricle are called

1. Chordae tendineae

2. Columnae carneae

3. Conus arteriosus

4. Truncus arteriosus

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 sino-atrial node is the normal pacemaker of the human heart because:

In the foetus, the ductus arteriosus connects the

1. pulmonary vein with pulmonary artery

2. pulmonary artery with aorta

3. pulmonary vein with aorta

4. pulmonary artery with vena cava

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

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

The thread like tendons of papillary muscles inserted upon the flaps of tricuspid and bicuspid valves are

(1) chordae tendinae

(2) yellow elastin fibres

(3) reticulate fibres

(4) collagen fibres

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

Inter atrial septa are:

(1) thin muscular

(2) thick muscular

(3) thin fibrous

(4) thick fibrous

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