The total cross-sectional area of capillaries in man is:
A.100 times that of aorta
B.200 times that of aorta
C.400 times that of aorta
D.500 times that of aorta
Category: Circulatory System Physiology Mcqs
Which of these refers to sounds in the heart:
A.Lubb
B.Dup
C.Both of these
D.None of these
Noradrenaline accelerates the beating of heart by:
A.Increasing the discharge rate of SA-node
B.Increasing the rate of conduction of excitability in various parts of the heart
C.Increasing the force with which the cardiac muscles contract
D.By bringing all these changes
Which of these will be produced in the body during fever when we have tachycardia:
A.Adrenaline
B.Noradrenaline
C.Both (a) & (b)
D.None of these
Time taken respectively in contraction and relaxation of ventricles is:
A.0.3 second and 0.5 second
B.0.2 second and 0.6 second
C.0.1 second and 0.7 second
D.0.5 second and 0.3 second
How much filling of the ventricle is done artrial systole:
A.10%
B.20%
C.30%
D.40%
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
After coming from gymnaseum, our heart rate would be:
A.Increased
B.Decreased
C.Both increased and decreased
D.Unchanged
Under which of these conditions, the heart rate is retarded by liberating acetylcholine:
A.Rest
B.Sleep
C.Both (a) & (b)
D.None of these
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
