Regarding blood circulation it may be said that in pheretima the dorsal vessel is a

Options

A. Collecting vessel in first two segments and distributing vessel in other
B. Distributing vessel in first five segments and collecting vessel in other
C. Collecting vessel in first thirteen segments and distributing vessel in intestinal region
D. Distributing vessel in first thirteen segments and collecting vessel in intestinal region

Answer

D

Explanation

From the posterior segment up to the 14th segment it receives two pairs of dorso intestinal vessels from the intestine in each segment through septo intestinal branch to the intestine.