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31.

Bundle of His in mammalian heart extends through:

A.	Wall of right auricle via auriculo-ventricular aperture	B.	Wall of left auricle via left auriculo-ventricular aperture
C.	Interventricular septum	D.	None of these

32.

Right fasciculum of bundle of His is:

A.	Cylindrical bundle made up of slender fibres	B.	Flattened and made up of band-like fibres
C.	Rounded with thick fibres	D.	None of these

33.

The rate of conduction through bundle of His is:

A.	Fast	B.	Very fast
C.	Slow	D.	Very slow

34.

Impulse passes through bundle of His at the rate of:

A.	1 mm per second	B.	3 mm per second
C.	5mm per second	D.	None of these

35.

Pacemaker of the heart is situated:

A.	In the wall of right auricle close to Eustachian valve	B.	On interauricular septum
C.	On interventricular septum	D.	In the wall of left auricle close to the opening of pulmonary vein

36.

SA-Node initiates heart beat in:

A.	Right auricle only	B.	Right auricle and partially in left also
C.	Right and left both	D.	Left auricle and partially in right also

37.

Which of these structures is respobsible for conducting heart beat in rabbit's heart:

A.	Node of Tawara	B.	AV-Node
C.	Perkinjie fibre	D.	All of these

38.

Neural control of heart beat is done by which of the following nerves:

A.	Parasympathetic fibres from vagus nerve	B.	Sympathetic fibres occurring in some spinal nerves
C.	Both of these fibres	D.	None of these

39.

Which of these nerve fibres accelerate the rate of heart beat:

A.	Parasympathetic nerve fibres from vagus nerve	B.	Sympathetic nerve fibres from some spinal nerves
C.	Both (a) & (b)	D.	None of these

40.

Slowing of heart rate in man is done by:

A.	Sympathetic nerve fibres by releasing noradrenaline	B.	Parasympathetic nerve fibres by releasing acetylcholine
C.	Sympathetic nerve fibres by releasing acetylcholine	D.	Parasympathetic nerve fibres by releasing noradrenaline