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Science 7 Earthworm

Earthworm Anatomy and Function

TermDefinition
anterior head end of the worm
posterior tail end of the worm
dorsal back side of the worm; darker
ventral belly side of the worm; lighter
prostomium part which hangs over the mouth; has some sensory ability
mouth cavity entrance to the digestive tube
brain bi-lobed; control center of the earthworm's body
pharynx used to swallow food; tough
esophagus connects the pharynx to the crop; food tube. adds saliva to moisten the food
aortic arches contracts and functions as hearts; there are 5
seminal receptacles receives sperm from another worm
seminal vesicles where sperm is stored for this worm
crop food is stored here until ready to be digested
gizzard where food is broken down by a grinding action; food is mechanically broken down here
nephridium removes cellular wastes from the body cavity; acts similar to our kidneys
intestine digestion of food occurs here; food chemically broken down here and absorbed into the blood
dorsal blood vessel carries blood forward to the heart; larger vessel
ventral blood vessel carries blood back toward skin and intestine; smaller vessel
ventral nerve cord connects brain with the rest of the body; white cord that extends the length of the body and carries messages
clitellum a thick band that forms a cocoon for the eggs
setae bristles that help the earthworm move
external outside
internal inside
coelom body cavity
septa partitions between the segments from the body wall
reproductive system to form sperm, eggs, and produce new offspring
digestive system to break down food into smaller pieces
excretory system to remove cellular and undigested wastes from the body
circulatory system to move food, oxygen, and water in the blood throughout the body
nervous system to control the earthworm's actions and activities through communication of messages
Created by: mccarville
 

 



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