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.

Both A and R is true and R is the correct explanation of A.

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

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A is true but R is false.

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Both A and R is false.

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Solution

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.

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Similar questions

Statement 1: A complex of blood vessels beginning and ending in capillaries through which blood circulates before returning to the heart is called a portal system.

Statement 2: All mammals have a hepatic portal system.

Assertion (A): A complex of veins 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.

Q. Assertion :In chordates a portal system is a complex of veins, which begins in capillaries and ends in capillaries before the blood, which courses through it, returns to the heart. Reason: All vertebrates have a hepatic portal system.

Q. The blood vessel that begins and ends in capillaries is the ______ (hepatic artery, hepatic portal vein, hepatic vein).

Statement 1: Portal vein begins from one organ as capillaries and ends in another organ as a vein.

Statement 2: The hepatic portal system is an example of the portal circulation.

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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.

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.