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Earthworm Anatomy 1. Segmented BodyEarthworms room classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The human body of the earthworm is segmentedwhich looks choose many little rings join or unify together. Theearthworm is made of around 100-150 segments. The segmented body partsprovide essential structural functions. Segmentation can help theearthworm move. Each segment or section has muscles and also bristles calledsetae. The bristles or setae aid anchor and also control the worm whenmoving v soil. The bristles hold a section of the worm firmlyinto the ground if the other component of the human body protrudes forward. Theearthworm supplies segments to one of two people contract or relax individually tocause the body to lengthen in one area or contract in other areas.Segmentation helps the worm to be flexible and strong in the movement.If each segment moved together without being independent, the earthwormwould it is in stationary.
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2.Digestive device The digestive system is partitioned into countless regions, eachwith a details function. The digestive system is composed of the pharynx,the esophagus, the crop, the intestine and the gizzard. Food such assoil beginning the earthworm’s mouth whereby it is swallowed by the pharynx.Then the soil passes v the esophagus, which has calciferousglands that relax calcium carbonate to rid the earthworm’s body ofexcess calcium. After it passes through the esophagus, the food movesinto the chop where it is stored and also then eventually moves right into thegizzard. The gizzard offers stones that the earthworm eats come grind thefood completely. The food moves right into the intestines together gland cell inthe intestine release fluids to help in the cradle process. Theintestinal wall contains blood vessels whereby the digested food isabsorbed and also transported come the remainder of the body.
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3.Circulatory System one more important organ system is the circulatory system.The earthworm has actually a closeup of the door circulatory system. An earthworm circulatesblood specifically through vessels. There are three key vessels thatsupply the blood come organs in ~ the earthworm. This vessels space theaortic arches, dorsal blood vessels, and also ventral blood vessels. Theaortic arches function like a person heart. Over there are 5 pairs ofaortic arches, which have actually the responsibility of pump blood right into thedorsal and also ventral blood vessels. The dorsal blood ship areresponsible for transferring blood come the former of the earthworm’s body.The ventral blood vessels are responsible for delivering blood come theback the the earthworm’s body.
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4.Respiratory system Earthworms carry out not have lungs. Lock breathe with theirskin. Oxygen and also carbon dioxide pass through the earthworm’s skin bydiffusion. Because that diffusion to occur, the earthworm’s skin need to be keptmoist.Body fluid and mucous is released to keep its skin moist. Earthwormstherefore, must be in wet or moist soil. This is one reason whythey usually surface ar at night as soon as it is perhaps cooler and the“evaporating potential that the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capacity to finding light also though they can not see. Theyhave tissue located at the earthworm’s head that is perceptible to light.These tissues permit an earthworm come detect light and not surfaceduring the daytime wherein they might be impacted by the sun.
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EarthwormReproduction Earthworms room hermaphrodites whereby each earthworm containsboth male and also female sex organs. The male and female sex guts canproduce sperm and egg dong in each earthworm. Althoughearthworms space hermaphrodites, most need a mate to reproduce. Duringmating, two worms heat up inverted native each various other so sperm deserve to beexchanged. The earthworms each have actually two male openings and two spermreceptacles, which take it in the sperm from one more mate. The earthwormshave a pair of ovaries that create eggs. The clitellum will form aslime tube about it, which will fill with an albuminous fluid. Theearthworm will relocate forward out of the slime tube. As the earthwormpasses with the slime tube, the tube will pass over the female porepicking increase eggs. The pipe will continue to relocate down the earthworm andpass end the male pore referred to as the spermatheca which has actually the storedsperm referred to as the spermatozoa. The eggs will fertilize and the slimetube will certainly close off as the worm moves totally out of the tube. Theslime tube will type an “egg cocoon” and be put into the soil.


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Thefertilized eggs will develop and become young worms.
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