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Earthworms&Mollusks

quiz

TermDefinition
annelid little ring
dorsal back/top side
ventral belly/bottom side
anterior toward the front
posterior toward the rear
setae bristles on every segment
clitellum saddle (band) toward the front end of the worm that secretes mucus to protect eggs
saprophytes eat dead/decomposing organic matter
worm casts/casting worm waste full of nutrients
external parasites suck the blood of a host
parapods fleshy feet used in locomotion
circular elongate the worm when they contract
longitudinal shortens the worms when they contract
mouth strong upper lip eats thru the soil (no jaws or teeth)
pharynx muscular organ used to swallow food
esophagus connects the pharynx to the crop
crop flexible organ that stores food
gizzard muscular organ that grinds food
intestine breaks food down and absorbs nutrients
anus excretes solid wastes (worm casts)
nephridia organs located in each segment that eliminate nitrogen wastes
CO2 diffuses through the skin
aortic arches 5 pairs of heart that pump blood through the body
function of circulatory system transport oxygen and nutrients to the body and wastes away
closed system blood is contained inside vessels
ventral blood vessels carries blood from the front to the back
dorsal blood vessels carries blood from back to front
secondary blood vessels and capillaries supply each segment
ganglion concentration of nerves
cerebral ganglion nerves that act as a brain
ventral nerve cord conducts impulses from brain to body
peripheral ganglia nerves that control each individual segment
seminal vesicles (larger white organs) produce sperm
seminal receptacles (smaller white organs) store sperm (from another worm) until eggs are released
clitellum secretes a mucous sac that stores fertilized eggs
Created by: KiahnaL
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