151.  

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

View Answer

152.  

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

View Answer

153.  

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

View Answer

154.  

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

View Answer

155.  

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

View Answer