Question

In earthworm lateral oesophageal heart connects:

• A. Dorsal vessel and ventral vessel
• B. Supra oesophageal vessel and lateral oesophageal vessel
• C. Dorsal vessel, supra oesophageal vessel and ventral vessel
• D. Dorsal vessel and subneural vessel

Answer 1

The correct option is C Dorsal vessel, supra oesophageal vessel and ventral vessel

Earthworm exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries and heart. In earthworm in each of the segments 7, 9, 12 and 13 is found a pair of large, thick, muscular and rhythmically contractile vertical vessels, called hearts. Out of these, lateral oesophageal hearts are the ones present in segments 12 and 13. The lateral oesophageal heart connects the dorsal vessel, the supraoesophageal vessel and the ventral vessel.
The dorsal vessel is the longest vessel that extends throughout the body of earthworm and lies above the alimentary canal. The ventral vessel is located below the alimentary canal at an anteroposterior position. Supra-oesophageal vessel lies on the stomach in the median position.