Question

Assertion (A): A complex of blood vessels beginning and ending in capillaries through which blood circulates before returning to the heart is called a portal system.

Reason (R): All mammals have a hepatic portal system.

• A. Both A and R is true and R is the correct explanation of A.
• B. Both A and R is true but R is not the correct explanation of A.
• C. A is true but R is false.
• D. Both A and R is false.

Answer 1

The correct option is B

Both A and R is true but R is not the correct explanation of A.

A portal system is a complex of blood vessels which begin and end in capillaries. A portal vein collects blood from a particular organ and distributes the blood to some other organ instead of sending it directly to the heart. All mammals have a hepatic portal system which carries blood from the digestive tract to the liver for various metabolic activities. Therefore, both A and R are true.