Biology · STRUCTURAL ORGANISATION IN ANIMALS

In the circulatory architecture of frogs, what define the hepatic portal system and renal portal system, respectively?

1. Arterial supply from the dorsal aorta to liver, and venous return directly from kidney to lungs.
2. Capillary network connecting brain to kidney, and lymphatic vessels linking liver to heart.
3. Venous connection between liver and intestine, and venous connection between kidney and lower parts of the body.
4. Venous connection between kidney and intestine, and venous connection between liver and hindlimbs.