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Earthworm Anatomy 1. Segmented BodyEarthworms room classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The body of the earthworm is segmentedwhich looks favor many small rings joined or unify together. Theearthworm is made of around 100-150 segments. The segmented body partsprovide important structural functions. Segmentation can assist theearthworm move. Every segment or section has actually muscles and bristles calledsetae. The bristles or setae aid anchor and also control the worm whenmoving with soil. The bristles hold a ar of the worm firmlyinto the ground if the other component of the body protrudes forward. Theearthworm uses segments to one of two people contract or relax individually tocause the human body to lengthen in one area or contract in other areas.Segmentation help the worm come be versatile and strong in that is movement.If each segment relocated together without gift independent, the earthwormwould be stationary.
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2.Digestive system The digestive system is partitioned into many regions, eachwith a certain function. The digestive system consists of the pharynx,the esophagus, the crop, the intestine and the gizzard. Food together assoil start the earthworm’s mouth where it is swallowed through the pharynx.Then the floor passes with the esophagus, which has actually calciferousglands that relax calcium lead carbonate to escape the earthworm’s body ofexcess calcium. After that passes with the esophagus, the food movesinto the chop where that is stored and also then eventually moves into thegizzard. The gizzard uses stones the the earthworm eats to grind thefood completely. The food moves right into the intestines as gland cells inthe intestine release fluids to aid in the digestive process. Theintestinal wall surface contains blood vessels wherein the digested food isabsorbed and also transported to the remainder of the body.
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3.Circulatory System an additional important organ device is the circulatory system.The earthworm has actually a close up door circulatory system. An earthworm circulatesblood solely through vessels. There space three main vessels thatsupply the blood come organs within the earthworm. This vessels space theaortic arches, dorsal blood vessels, and ventral blood vessels. Theaortic arches role like a person heart. Over there are five pairs ofaortic arches, which have actually the responsibility of pump blood right into thedorsal and also ventral blood vessels. The dorsal blood vessels areresponsible for moving blood to the prior of the earthworm’s body.The ventral blood vessels room responsible for delivering blood to theback of the earthworm’s body.
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4.Respiratory mechanism Earthworms perform not have lungs. Castle breathe through theirskin. Oxygen and carbon dioxide pass with the earthworm’s skin bydiffusion. For diffusion come occur, the earthworm’s skin should be keptmoist.Body fluid and mucous is exit to save its skin moist. Earthwormstherefore, need to be in damp or moist soil. This is one reason whythey usually surface ar at night once it is possibly cooler and the“evaporating potential the the air is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capability to detect light even though they can not see. Theyhave tissue situated at the earthworm’s head that is perceptible to light.These tissues allow an earthworm to detect light and not surfaceduring the daytime wherein they could be influenced by the sun.
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EarthwormReproduction Earthworms room hermaphrodites wherein each earthworm containsboth male and also female sex organs. The male and female sex offal canproduce sperm and egg dong in every earthworm. Althoughearthworms space hermaphrodites, most need a mate come reproduce. Duringmating, two worms heat up inverted from each various other so sperm can beexchanged. The earthworms each have two male openings and also two spermreceptacles, which take in the sperm from one more mate. The earthwormshave a pair of ovaries that produce eggs. The clitellum will form aslime tube approximately it, which will fill through an albuminous fluid. Theearthworm will move forward the end of the slime tube. As the earthwormpasses v the slime tube, the tube will certainly pass over the mrs porepicking up eggs. The tube will continue to relocate down the earthworm andpass over the masculine pore called the spermatheca which has actually the storedsperm dubbed the spermatozoa. The eggs will certainly fertilize and the slimetube will certainly close off as the worm moves completely out that the tube. Theslime pipe will form an “egg cocoon” and also be put right into the soil.


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Thefertilized eggs will certainly develop and also become young worms.
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