Q. In Pheretima, gizzard, buccal cavity, pharynx, oesophagus, pharyngeal nephridia receive the blood from which of the following blood vessel?
A) Supra oesophageal
B) Lateral oesophageal
C) Dorsal blood
D) Subneural
Explanation
In Pheretima posthuma, the dorsal blood vessel is considered as dorsal tubular heart. This blood vessel is a collecting blood vessel behind 13^(th) segment, while in initial 13 segment, it works as the distributing vessel. The blood flows in it from backward to forward.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.