Biology - Structural Organisation in Animals Question with Solution | TestHub
Assertion - (A) The hepatic portal vein exhibits a wide lumen and comparatively thinner tunica media.
Reason - (R) Its endothelial lining is arranged in a tessellated pattern to facilitate exchange between blood and hepatocytes.
Choose the correct option from the following.
Options:
Answer:
Solution:
The hepatic portal vein is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas, and spleen to the liver. Like other veins, it has a wider lumen and a comparatively thinner tunica media than arteries. Thus, Assertion (A) is true.
The exchange of materials between the blood and hepatocytes does not occur across the walls of the hepatic portal vein. Instead, the hepatic portal vein branches into smaller venules that eventually empty into the hepatic sinusoids. The hepatic sinusoids are highly permeable capillaries with fenestrated endothelial linings that facilitate the actual exchange of substances between the blood and hepatocytes. Therefore, Reason (R) is false.
Answer: (A) is true; however, statement (R) is false.
