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 How is the circulatory system designed in leech to compensate the heart structure ?
 
a. In leeches, do have  blood vessels.
 
b. In leeches, the blood vessels are replaced with , which replace the blood vessels. The  fills these channels. The coelomic fluid contains .
  
c. The longitudinal canals are divided into  sections. One is dorsal and lies  the alimentary canal, while the other is ventral and lies  it. The remaining two are between the alimentary canal and are called . At the back of the mouth, the four canals are connected.
  
d. The two channels are present on the lateral side of  the alimentary canal, which functions as a .

e. All four channels are connected posteriorly in the  segment.