Question

Dorsal vessel of earthworm is

• A. Distributing
• B. Collecting
• C. Collecting in first thirteen segments and distributing in the rest
• D. Distributing in first thirteen segments and collecting in the rest

Answer 1

The correct option is D Distributing in first thirteen segments and collecting in the rest

The earthworm has a closed vascular system with blood vessels. The dorsal vessel in the first thirteen segments acts as a distributing vessel and extends upto the cerebral ganglion. It gives of branches that supply blood to the anterior regions of the body. After the thirteenth segment it acts as a collecting blood vessel and in each segment it receives blood from a pair of dorsointestinal vessels and commissural vessel.

So, the correct answer is 'Distributing in the first thirteen segments and collecting in the rest'.