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34 Cards in this Set
- Front
- Back
What kind of symmetry does an earthworm have?
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Bilateral Symmetry
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Worms were the first to....
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evolve with distinct head and tail regions.
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What phylum are earthowrms in?
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Phylum Annelida
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What role do worms play in the environment?
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- airates soil
- fertilizes soil - makes a better environment for plants to grow |
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Circulatory System
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contains:
- hearts (5) - ventral vessel - dorsal vessel through which all bodily fluids move |
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Respiratory System
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-simple O2 -> CO2 exchange occurs through the skin
-worm must be moist for this to occur |
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Simple Nervous System
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- brain (small)
- 2 nerves - nerve cord |
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Digestive System
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mouth->pharynx->esophagus-> crop->gizzard->intestine->anus
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Reproductive System
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- hermaphrodites(male&female)
- cross fertilization - organs under clitellum |
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Dorsal
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Top side of an organism
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Ventral
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Bottom side of an organism
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Anterior
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Front side of an organism
(Near mouth) |
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Posterior
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Back side of an organism
(Near anus) |
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Segments
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- ringlike segments make up an earthworm's body
- 100+ |
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Prostomium
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- on anterior side
- small lobe - used for burrowing |
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Setae
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- help the worm move through the ground
- on the ventral side - four pairs on each segment |
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Mouth
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- used to eat things
- part of the digestive system |
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Pharynx
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- muscular
- helps to ingest food - part of digestive system |
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Esophagus
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- leads from the pharynx to the crop
- part of digestive system |
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Crop
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- an enlarged storage sac
- part of digestive system |
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Gizzard
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- food is grinded here by swallowed stones & heavy muscular contractions
- part of digestive system |
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Intestine
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- leads from gizzard to anus
- responsible for most of the digestion & absorption of food - part of digestive system |
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Anus
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- located on posterior side
- lets out wastes - part of digestive system |
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Hearts
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- pump blood through the two major blood vessels
- 5 hearts - part of circulatory system |
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Ventral Vessel
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- one of major blood vessels
- moves blood anteriorly - part of circulatory system |
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Dorsal Vessel
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- one of major blood vessels
- moves blood posteriorly - part of circulatory system |
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Brain
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- small
- part of the nervous system |
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Ventral Nerve Cord
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- extends through the length of the worm
- part of nervous system |
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Seminal Vesicles
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- 3 large, white structures
- contain testes - make sperm - part of reproductive system |
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Seminal Receptacles
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- receive & store sperm from mate
- part of reproductive system |
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Ovaries
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- contain eggs
- part of reproductive system |
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Male and Female Pores
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male pore
- releases sperm female pore - releases eggs |
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Clitellum
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- part of reproductive system
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Nephridia
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- small coiled tubules
- one on each side of ventral nerve cord - collect waste from coelom & blood vessels and expel it outside through small pores - part of excretory system |