Question

The deoxygenated blood from the hind limbs of the frog is finely grained into
A. Renal vein
B. Hepatic vein
C. Renal portal vein
D. Hepatic portal vein

Answer 1

Hint: In frogs, deoxygenated blood from the hind limb goes to the kidney by renal veins. These veins divide into capillaries when entering the kidney, This type of vein system is known as the portal system.

Complete answer: Normally veins collect blood from different body parts and carry it to the heart but some veins divide into capillaries and take the blood into different organs before carrying the blood into the heart. These veins are called portal veins. The hind limb part of the frog contains more waste product and is the most active part. The deoxygenated blood collected from the hind limb is transported through the renal vein to the kidney. This type of portal is called renal vein portal. Deoxygenated blood is delivered to the inferior vena cava from the kidney by the renal vein. Deoxygenated blood is delivered to the inferior vena cava from the liver by the hepatic vein. The renal portal vein is tributaries of the renal vein that collect deoxygenated blood from the hindlimb through the renal vein to the kidney. So the deoxygenated blood from the hind limbs of the frog is finally grained into the renal portal vein. Veins form a network of capillaries in the liver known as hepatic portal vein. These veins carry deoxygenated blood to the liver from the alimentary canal. Reptiles and amphibians have a closed circulatory system. Reptiles (crocodiles have four chambers) and amphibians have three chambers, two atria and one ventricle.

Note: There are two types of portal system: hepatic portal system and renal portal system. Fishes, amphibians and reptiles have both types of systems, whereas mammals have only the hepatic portal system.