In frog, the Renal portal system is a special venous connection that acts to link :

The correct answer is Kidney and lower part of the body.

Explanation:

• Special venous connection between liver and intestine as well as the kidney and lower parts of the body are present in frogs. The former is called the hepatic portal system and the latter is called renal portal system.
• The circulatory system in frogs consists of a heart, blood vessels, and blood. It includes different types of blood vessels such as arteries, veins, and capillaries.
  • Hepatic Portal System: This system involves a network of veins that carry blood from the digestive organs and spleen to the liver. This allows the liver to process and detoxify substances absorbed from the digestive tract before they enter the general circulation.
  • Renal Portal System: This system consists of veins that carry blood from the lower part of the body, particularly the hind limbs, to the kidneys. This allows the kidneys to filter out waste products and excess substances from the blood before it returns to the heart.