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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 like many little rings joined or fused together. Theearthworm is made of around 100-150 segments. The segmented human body partsprovide necessary structural functions. Segmentation can help theearthworm move. Every segment or section has actually muscles and bristles calledsetae. The bristles or setae assist anchor and also control the worm whenmoving v soil. The bristles organize a ar of the worm firmlyinto the ground while the other component of the human body protrudes forward. Theearthworm uses segments to one of two people contract or relax independently tocause the body to lengthen in one area or contract in other areas.Segmentation helps the worm to be flexible and solid in its movement.If every segment moved together without being independent, the earthwormwould it is in stationary.
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2.Digestive device The digestive device is partitioned into plenty of regions, eachwith a certain function. The digestive system consists of the pharynx,the esophagus, the crop, the intestine and the gizzard. Food together assoil enters the earthworm’s mouth whereby it is swallowed by the pharynx.Then the soil passes through the esophagus, which has actually calciferousglands that relax calcium lead carbonate to escape the earthworm’s body ofexcess calcium. After it passes v the esophagus, the food movesinto the crop where the is stored and then at some point moves into thegizzard. The gizzard offers stones the the earthworm eats to grind thefood completely. The food moves into the intestines as gland cell inthe intestine relax fluids to help in the digestive process. Theintestinal wall contains blood vessels whereby the digested food isabsorbed and also transported to the rest of the body.
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3.Circulatory System another important organ system is the circulatory system.The earthworm has a closed circulatory system. One earthworm circulatesblood solely through vessels. There room three main vessels thatsupply the blood come organs within the earthworm. This vessels are theaortic arches, dorsal blood vessels, and also ventral blood vessels. Theaortic arches role like a human heart. Over there are 5 pairs ofaortic arches, which have the obligation of pump blood into thedorsal and ventral blood vessels. The dorsal blood ship areresponsible for transferring blood to the former of the earthworm’s body.The ventral blood vessels room responsible for delivering blood come theback of the earthworm’s body.
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4.Respiratory device Earthworms carry out not have actually lungs. Castle breathe v 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, need to be in wet or moist soil. This is one reason whythey usually surface at night once it is possibly cooler and also the“evaporating potential the the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capability to recognize light also though they can not see. Theyhave tissue located at the earthworm’s head the is perceptible to light.These tissues enable an earthworm to detect light and not surfaceduring the daytime whereby they could be influenced by the sun.
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EarthwormReproduction Earthworms space hermaphrodites whereby each earthworm containsboth male and also female sex organs. The male and female sex organs canproduce sperm and also egg respectively in every earthworm. Althoughearthworms room hermaphrodites, many need a mate to reproduce. Duringmating, 2 worms line up inverted indigenous each other so sperm can beexchanged. The earthworms each have actually two masculine 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 roughly it, which will fill v an albuminous fluid. Theearthworm will move forward the end of the slime tube. Together the earthwormpasses with the slime tube, the tube will certainly pass end the woman porepicking increase eggs. The tube will continue to move down the earthworm andpass end the masculine pore dubbed the spermatheca which has the storedsperm called the spermatozoa. The eggs will certainly fertilize and also the slimetube will close off together the worm moves totally out of the tube. Theslime pipe will form 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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