A : SAN initiates the heart beat
R : Sympathetic nerve fibres increase the cardiac activity.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is not true
D. A is not true but R is true
Answer : Option B
A : In healthy arteries, the innermost layer of the wall is smooth.
R : In healthy person diastolic pressure is 120 mm Hg
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is not true
D. A is not true but R is true
Answer : Option C
A : Atherosclerosis is known as hardening of arteries
R : The arterial walls become thick and inelastic due to deposition of cholesterol and calcium
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is not true
D. A is not true but R is true
Answer : Option B
A : In normal condition cardiac output of healthy person is 5000ml/min.
R : In normal condition volume stroke is 70 ml.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is not true
D. A is true but R is not true
Answer : Option A
A : Clotting of blood is characteristic of human blood
R : Each erythrocytes possess Hb.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is not true
D. A is not true but R is true
Answer : Option B