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71.

Ichaemia of myocardium in a person may often lead to:

A.	Mycardial infraction	B.	Tachycardia
C.	Bradycardia	D.	None of these

72.

Blood pressure is the force which:

A.	Heart exerts on blood going out of it	B.	Blood pushes against the walls of blood vessels
C.	Blood vessels exert on the blood	D.	None of these but something else

73.

Systolic blood pressure in a young man normally is:

A.	70mm of Hg	B.	80mm of Hg
C.	100mm of Hg	D.	120mm of Hg

74.

Diastolic blood pressure in a normal healthy man is:

A.	60mm of Hg	B.	80mm of Hg
C.	100mm of Hg	D.	120mm of Hg

75.

Instrument for measuring blood pressure is called:

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

76.

Regulation of heart beat in mammals is only due to:

A.	Presence of excess oxygen into blood	B.	Presence of pace-maker in the heart
C.	Presence of thyroxine in the blood	D.	Volume of blood in the system

77.

Persons suffering from hypertension should take following precautions in order to avoid excessive rise in he their blood pressure:

A.	Avoid standing	B.	Avoid emotional disturbances and excitements
C.	Sleep as much as possible	D.	Increase their body weight

78.

Pace-maker in heart of man influences:

A.	Contraction of pelvis	B.	Rate of heartbeat
C.	Contraction of heart muscles	D.	Nerve impulse formation

79.

A pace-maker is found in the:

A.	Liver	B.	Brain
C.	Heart	D.	Lungs

80.

Heart beat in man is initiated by:

A.	SA-Node	B.	AV-Node
C.	Purkinjie fibres	D.	Carotid labyrinth