It is a straight tube and runs from the first to the last segments. It consists of mouth(peristomium),buccal cavity , pharynx, oesophagus,a muscular gizzard, stomach, intestine and anus
In earthworm ,the circulation is closed type.The circulatory system consists of heart, blood vessels, capillaries and blood glands
Segmentally arranged nephridia are the excretory organs.
There are three types of nephridia
The nervous system consists of segmentally arranged ganglia and a ventral nerve cord. A ganglion is a mass of nerve cells.
Ventral Nerve cord
Earthworm is hermaphrodite or bisexual .
Male reprodutive organs