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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 choose many small rings join or unify together. Theearthworm is make of around 100-150 segments. The segmented human body partsprovide crucial structural functions. Segment can help theearthworm move. Each segment or section has muscles and bristles calledsetae. The bristles or setae assist anchor and control the worm whenmoving with soil. The bristles host a ar of the worm firmlyinto the ground while the other component of the human body protrudes forward. Theearthworm provides segments to either contract or relax independently tocause the human body to lengthen in one area or contract in various other areas.Segmentation helps the worm to be functional and strong in that movement.If each segment relocated together without gift independent, the earthwormwould it is in stationary.
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2.Digestive device The digestive system is partitioned into plenty of regions, eachwith a specific function. The digestive system is composed of the pharynx,the esophagus, the crop, the intestine and the gizzard. Food such assoil start the earthworm’s mouth wherein it is swallowed by the pharynx.Then the soil passes through the esophagus, which has actually calciferousglands that relax calcium carbonate to rid the earthworm’s body ofexcess calcium. After the passes through the esophagus, the food movesinto the crop where the is stored and then ultimately moves into thegizzard. The gizzard provides stones the the earthworm eats come grind thefood completely. The food moves into the intestines as gland cell inthe intestine relax fluids to help in the digestive process. Theintestinal wall surface contains blood vessels wherein the spend food isabsorbed and also transported to the remainder of the body.
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3.Circulatory System another important organ mechanism is the circulatory system.The earthworm has actually a closed circulatory system. One earthworm circulatesblood specifically through vessels. There are three key vessels thatsupply the blood come organs within the earthworm. This vessels are theaortic arches, dorsal blood vessels, and ventral blood vessels. Theaortic arches role like a human heart. There are 5 pairs ofaortic arches, which have the duty of pump blood into thedorsal and also ventral blood vessels. The dorsal blood ship areresponsible for transporting blood come the prior of the earthworm’s body.The ventral blood vessels space responsible for carrying blood come theback the the earthworm’s body.
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4.Respiratory device Earthworms execute not have lungs. They breathe through theirskin. Oxygen and also carbon dioxide pass with the earthworm’s skin bydiffusion. For diffusion come occur, the earthworm’s skin should be keptmoist.Body fluid and also mucous is exit to store its skin moist. Earthwormstherefore, should be in wet or moist soil. This is one factor whythey usually surface at night once it is maybe cooler and the“evaporating potential the the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capacity to finding light even though they can not see. Theyhave tissue situated at the earthworm’s head the is sensitive to light.These tissues enable an earthworm to detect light and also not surfaceduring the daytime wherein they could be impacted by the sun.
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EarthwormReproduction Earthworms room hermaphrodites whereby each earthworm containsboth male and female sex organs. The male and female sex guts canproduce sperm and also egg dong in every earthworm. Althoughearthworms are hermaphrodites, many need a mate come reproduce. Duringmating, two worms line up inverted native each other so sperm have the right to beexchanged. The earthworms each have two male openings and two spermreceptacles, which take it in the sperm from an additional mate. The earthwormshave a pair the ovaries that develop eggs. The clitellum will kind aslime tube about it, which will certainly fill through an albuminous fluid. Theearthworm will move forward out of the slime tube. Together the earthwormpasses through the slime tube, the tube will pass end the mrs porepicking increase eggs. The tube will proceed to relocate down the earthworm andpass end the male pore called the spermatheca which has actually the storedsperm referred to as the spermatozoa. The eggs will certainly fertilize and the slimetube will certainly close off as the worm moves fully out that the tube. Theslime pipe will type an “egg cocoon” and be put into the soil.


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Thefertilized eggs will certainly develop and also become young worms.
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