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Earthworm Anatomy 1. Segmented BodyEarthworms are classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The body of the earthworm is segmentedwhich looks choose many little rings join or fused together. Theearthworm is do of around 100-150 segments. The segmented human body partsprovide essential structural functions. Segmentation can assist theearthworm move. Each segment or section has actually muscles and bristles calledsetae. The bristles or setae help anchor and also control the worm whenmoving v soil. The bristles organize a section of the worm firmlyinto the ground while the other component of the human body protrudes forward. Theearthworm offers segments to either contract or relax independently tocause the body to lengthen in one area or contract in various other areas.Segmentation help the worm to be functional and solid in that is movement.If each segment relocated together without being independent, the earthwormwould be stationary.
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2.Digestive system The digestive system is partitioned into countless regions, eachwith a particular function. The digestive system is composed of the pharynx,the esophagus, the crop, the intestine and also the gizzard. Food such assoil enters the earthworm’s mouth wherein it is swallowed by the pharynx.Then the floor passes with the esophagus, which has calciferousglands that relax calcium lead carbonate to escape the earthworm’s human body ofexcess calcium. After that passes through the esophagus, the food movesinto the crop where that is stored and then at some point moves right into thegizzard. The gizzard supplies stones that the earthworm eats to grind thefood completely. The food moves right into the intestines together gland cell inthe intestine relax fluids to assist in the cradle process. Theintestinal wall contains blood vessels where the spend food isabsorbed and transported come the rest of the body.
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3.Circulatory System one more important organ device is the circulatory system.The earthworm has actually a closed circulatory system. An earthworm circulatesblood exclusively through vessels. There space three key vessels thatsupply the blood come organs within the earthworm. This vessels room theaortic arches, dorsal blood vessels, and also ventral blood vessels. Theaortic arches duty like a human heart. Over there are 5 pairs ofaortic arches, which have the duty of pumping blood into thedorsal and also ventral blood vessels. The dorsal blood ship areresponsible for moving blood come the prior of the earthworm’s body.The ventral blood vessels are responsible for moving blood come theback that the earthworm’s body.
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4.Respiratory device Earthworms perform not have actually lungs. They breathe with theirskin. Oxygen and also carbon dioxide pass through the earthworm’s skin bydiffusion. Because that diffusion to occur, the earthworm’s skin must be keptmoist.Body fluid and mucous is exit to save its skin moist. Earthwormstherefore, must be in damp or moist soil. This is one reason whythey usually surface ar at night once it is probably cooler and also the“evaporating potential the the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the ability to recognize light also though they can not see. Theyhave tissue situated at the earthworm’s head that is sensitive to light.These tissues allow an earthworm come detect light and also not surfaceduring the daytime wherein they can be impacted by the sun.
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EarthwormReproduction Earthworms room hermaphrodites wherein each earthworm containsboth male and female sex organs. The male and female sex offal canproduce sperm and egg dong in each earthworm. Althoughearthworms space hermaphrodites, many need a mate to reproduce. Duringmating, two worms heat up inverted indigenous each other so sperm can beexchanged. The earthworms each have two male openings and also two spermreceptacles, which take in the sperm from an additional mate. The earthwormshave a pair of ovaries that produce eggs. The clitellum will form aslime tube approximately it, which will fill v an albuminous fluid. Theearthworm will move forward out of the slime tube. Together the earthwormpasses with the slime tube, the tube will pass over the woman porepicking increase eggs. The pipe will proceed to move down the earthworm andpass over the male pore called the spermatheca which has the storedsperm referred to as the spermatozoa. The eggs will fertilize and also the slimetube will certainly close off together the worm moves fully out that the tube. Theslime pipe will form an “egg cocoon” and also be put into the soil.


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Thefertilized eggs will develop and become young worms.
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