Which of these substances will be produced by our body in order to bring state of bradycardia:
A.Acetylchoiline
B.Adrenaline
C.Both (a) & (b)
D.None of these
Category: Circulatory System Physiology Mcqs
Heart beat in man is initiated by:
A.SA-Node
B.AV-Node
C.Purkinjie fibres
D.Carotid labyrinth
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
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
Acetylcholine retards the rate of heart beating by:
A.Decreasing the rate of initiation of heart beat in SA-Node
B.Decreasing the excitability of fibres of internodal pathway
C.Both (a) & (b)
D.None of these
Instrument for measuring blood pressure is called:
A.Sphygnomanometer
B.Electrocardiograph
C.Stethescope
D.None of these
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
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
Sphygnomanometer means an instrument that measures:
A.Heart rate
B.Blood pressure
C.Pulse rate
D.All of these
Why do we have techycardia during fever?
A.Because the increase in temperature increase the heart rate
B.Because parasympathetic system releases more sympathin
C.Because more acetylcholine is liberated at the free nerve endings of sympathetic nerve fibres
D.Because of some reason other than these
