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21.

Which of these refers to sounds in the heart:

A.	Lubb	B.	Dup
C.	Both of these	D.	None of these

22.

Closure of tricuspid and bicuspid valves during ventricular contraction produces:

A.	Low-pitched sound called 'lubb'	B.	High pitched sound called 'dup'
C.	First 'lubb' and then 'dup'	D.	None of these

23.

At the end of ventricular systole the closure of semilunar valves of pulmonary and systemic aortae produces a sound called:

A.	Lubb	B.	Dup
C.	Murmur	D.	None of these

24.

The heart sounds can be heard by using a:

A.	Stethescope	B.	Electrocardiograph
C.	Sphygnomanometer	D.	None of these

25.

Which of these are conducting elements in the heart of mammals:

A.	SA-Node	B.	AV-Node
C.	Bundle of His	D.	All of these

26.

Node of Tawara in rabbit's heart is:

A.	SA-Node	B.	AV-Node
C.	Ventricular node	D.	None of these

27.

SA-Node in rabbit's heart is found in the:

A.	Wall of right auricle near the opening of right anterior vena cava	B.	Wall of left ventricle close to the opening of pulmonary veins
C.	Wall of right auricle near the interauricular septum	D.	Wall of right ventricle near the auriculo-ventricular valve

28.

Principle pacemaker in mammalian heart is:

A.	SA-Node	B.	AV-Node
C.	Perkinjie fibre	D.	None of these

29.

Mass of self-excitatory nodal fibres in mammalian heart is represented by:

A.	SA-Node	B.	Semilunar valves at the entrances of main aortae
C.	Bicuspid and tricuspid valves	D.	None of these

30.

The impulse from SA-Node to AV-Node is conducted by means of:

A.	Wall of right auricle itself	B.	A bundle of specialized fibres
C.	Bundle of His	D.	None of these