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Earthworm Anatomy 1. Segmented BodyEarthworms space classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The human body of the earthworm is segmentedwhich looks prefer many small rings join or fused together. Theearthworm is do of around 100-150 segments. The segmented human body partsprovide vital structural functions. Segmentation can aid theearthworm move. Each segment or section has muscles and bristles calledsetae. The bristles or setae help anchor and control the worm whenmoving with soil. The bristles organize a ar of the worm firmlyinto the ground while the other part of the human body protrudes forward. Theearthworm supplies segments to one of two people 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 flexible and strong in that is movement.If each segment moved together without gift independent, the earthwormwould it is in stationary.
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2.Digestive mechanism The digestive mechanism is partitioned into numerous regions, eachwith a specific 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 soil passes with the esophagus, which has actually calciferousglands that release calcium lead carbonate to rid the earthworm’s human body ofexcess calcium. After the passes v the esophagus, the food movesinto the crop where the is stored and then eventually moves right into thegizzard. The gizzard uses stones that the earthworm eats to grind thefood completely. The food moves right into the intestines as gland cells inthe intestine relax fluids to help in the cradle process. Theintestinal wall contains blood vessels whereby the spend food isabsorbed and transported come the rest 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. An earthworm circulatesblood specifically through vessels. There space three key vessels thatsupply the blood to organs in ~ the earthworm. This vessels space theaortic arches, dorsal blood vessels, and ventral blood vessels. Theaortic arches function like a person heart. Over there are 5 pairs ofaortic arches, which have actually the responsibility of pumping blood into thedorsal and ventral blood vessels. The dorsal blood ship areresponsible for moving blood come the former of the earthworm’s body.The ventral blood vessels are responsible for carrying blood come theback that the earthworm’s body.
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4.Respiratory device Earthworms execute not have lungs. They breathe v theirskin. Oxygen and also carbon dioxide pass with the earthworm’s skin bydiffusion. Because that diffusion come occur, the earthworm’s skin should be keptmoist.Body fluid and mucous is exit to keep its skin moist. Earthwormstherefore, have to be in damp or moist soil. This is one reason whythey usually surface at night once it is possibly cooler and also the“evaporating potential of the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capability to finding light also though they cannot see. Theyhave tissue located at the earthworm’s head that is perceptible to light.These tissues permit an earthworm to detect light and also not surfaceduring the daytime where they can be impacted by the sun.
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EarthwormReproduction Earthworms are hermaphrodites wherein each earthworm containsboth male and also female sex organs. The male and also female sex guts canproduce sperm and also egg respectively in every earthworm. Althoughearthworms are hermaphrodites, most need a mate come reproduce. Duringmating, 2 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 in the sperm from one more mate. The earthwormshave a pair that ovaries that create eggs. The clitellum will kind aslime tube around it, which will fill with an albuminous fluid. Theearthworm will relocate forward the end of the slime tube. As the earthwormpasses with the slime tube, the tube will pass end the female porepicking increase eggs. The tube will continue to relocate down the earthworm andpass end the masculine pore referred to as the spermatheca which has actually the storedsperm dubbed the spermatozoa. The eggs will fertilize and also the slimetube will certainly close off as the worm moves fully out the the tube. Theslime pipe will kind an “egg cocoon” and also be put into the soil.


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Thefertilized eggs will certainly develop and also become young worms.
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