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15 Cards in this Set

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why are earthworms of crucial importance?
they are scavengers and feed on dead and decaying organic material. they aerate the soil and breakdown organic matter.
prostomium
the first fleshy lobe at the anterior end of the earthworm in front of the mouth
mouth
opening that serves are the start of the digestive tract found betweeen the prostomium and peristomium
clitellum
swollen glandular area that secretes a slimy material to form a cover for the eggs during reproduction
anus
opening at the end of the digestive tract
pharynx
muscular throat like tube pumps food from mouth to esophagus
esophagus
narrow tube carrying food from the pharynx into the crop
crop
thin walled storage chamber for food received from esophagus
gizzard
muscular chamber that grinds food follows the crop
intestine
functions in digestion and absorption follows the gizzard
rectum
last part of the digestive tract which empties out the anus follows the intestine
what are the excretory products of eart worms?
ammonia and urea
suprapharyngeal ganglion
a mass of nerve cells above the pharynx and connected by nerve chords and subpharaygal ganglion below thus the gut passes thro the brain
ventral nerve cord
transmits nerve impules to and from the brain it lies beneath the digestive tract
segmental ganglia
small masses of nerve cells in each segment which coordinate activites in each segment