earthworm anatomy
***one page of the dissection packet is the quiz and the whole packet is the test
the earthworm slideshow
https://quizlet.com/141545952/earthworm-dissection-flash-cards/
- segments * ring-like structures
- anterior segments * sensory organs
- segments connected by circulatory and nervous system
- 120-170 segments when fully developed
prostomium
- covers mouth
- mouth under prostomium
needs moisture to survive
clitellum
- cocoon for eggs
heart
- has 5 hearts * or 5 aortic arches
- closed circulatory system
internal anatomy
- crop
- mouth
- pharynx
- intestine
- gizzard
- anus
- esophagus
- pharyngeal muscles
hermaphrodites
- both male and female reproductive organs
benefits
- biological * earthworms play a major role in converting large pieces of organic mater into rich humus and thus improving soil fertility
- chemical * fresh earthworm casts are 5 times richer in available nitrogen, 7 times richer in avaliabloe phosphotes and 11 times richer in avaliable potash
digestive track
- mouth
- pharynx
- esophagus
- crop
- gizzard
- intestines
- anus
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