Question

Number of lateral hearts in Pheretima are

• A. 8
• B. 12
• C. 16
• D. 4

Answer 1

The correct option is A 8

In Pheretima the posterior segments behind 13th the dorsal and ventral blood vessels have no direct connections but anteriorly both these vessels are connected together by 4 pairs of pulsatile hearts which are neurogenic, i.e., the heartbeat originates in the nerve cells of the hearts. The hearts are contractile and encircle the alimentary canal, they are in the segments 7th, 9th, 12th, and 13th.

So the correct answer is '8'.