The venous system of frog differs from that of a mammals in the presence of

Renal portal system

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Hepatic portal system

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Three superior venacava

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Hepatic vein

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Solution

The correct option is D Renal portal system
The renal portal system is involved in the function to move blood from the renal glomeruli to the peritubular plexus that surround the proximal and distal convoluted tubules. The renal portal system is found only in fishes, amphibians, reptiles and birds. Thus, mammals have no renal portal system.
So, the correct answer is option A.

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Similar questions

Q. Assertion :There is hepatic portal system in frogs. Reason: It is venous connection between liver and intestine in frog.

Q. Which of the following statements are correct?
1. Frogs lack nictitating membrane.
2. Frogs have 3 chambered heart.
3. Frogs possess 2 portal systems: renal portal system & hepatic portal system.

Q. The table shows the functions of portal system in a frog. Choose the best option given below.

I.Portal System	II.Function
A) Renal portal system	Collects blood from all parts of the body
B) Renal portal system	Carries blood from hind limbs to kidneys
C) Hepatic portal system	Carries blood from liver to alimentary canal

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.

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.

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