Test 3-Annelida Flashcards
Nearest Relatives
arthropod
Relative complexity
Simple
Importance to humans
food for animals/birds
enrich the soil enough to allow oxygen and water to enter it
leech therapy (inflammation) when the leech attaches to the affected area, they begin to suck the blood which will prevent blood clots from occurring (leech’s saliva)
Life Cycle
reproduce only sexually hermaphroditic (earthworms) cross fertilize (can mate with other earthworms)
Common representatives
earthworms, sandworms, leech
Environment or habitat
terrestrial, aquatic, parasitic
Muscles
radial and circular muscles
in two directions-circular and lenght
Length
Microscopic to up to 9 feet in length
Coelom
true body cavity
Respiratory System
not a real one, skin is permeable
Circulatory system
closed-when blood stays in a vessel
5 hearts
Nervous system
no brain
Setae
hair or bristles
How they live
in groups
Segments
grow one at a time, first to have true segmentation
