|Earthworm Anatomy 1. Segmented BodyEarthworms space classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The body of the earthworm is segmentedwhich looks like many little rings join or fused together. Theearthworm is make of around 100-150 segments. The segmented body partsprovide important structural functions. Segment can aid theearthworm move. Each segment or section has actually muscles and also bristles calledsetae. The bristles or setae assist anchor and control the worm whenmoving through soil. The bristles hold a section of the worm firmlyinto the ground while the other part of the human body protrudes forward. Theearthworm provides segments to either contract or relax separately tocause the human body to lengthen in one area or contract in other areas.Segmentation help the worm come be functional and solid in that movement.If each segment relocated together without being independent, the earthwormwould be stationary. || |
|2.Digestive mechanism The digestive device is partitioned into numerous regions, eachwith a certain function. The digestive system is composed of the pharynx,the esophagus, the crop, the intestine and also the gizzard. Food such assoil beginning the earthworm’s mouth where it is swallowed by the pharynx.Then the floor passes through the esophagus, which has actually calciferousglands that relax calcium lead carbonate to escape the earthworm’s body ofexcess calcium. After the passes v the esophagus, the food movesinto the chop where that is stored and then ultimately moves into thegizzard. The gizzard uses stones that the earthworm eats come grind thefood completely. The food moves into the intestines together gland cells inthe intestine relax fluids to help in the cradle process. Theintestinal wall surface contains blood vessels whereby the spend food isabsorbed and also transported to the remainder of the body. || |
|3.Circulatory System another important organ system is the circulatory system.The earthworm has a closed circulatory system. An earthworm circulatesblood specifically through vessels. There space three key vessels thatsupply the blood come organs in ~ the earthworm. This vessels space theaortic arches, dorsal blood vessels, and ventral blood vessels. Theaortic arches function like a human heart. There are five pairs ofaortic arches, which have the responsibility of pump blood into thedorsal and ventral blood vessels. The dorsal blood vessels areresponsible for transferring blood come the front of the earthworm’s body.The ventral blood vessels room responsible for transferring blood come theback that the earthworm’s body. || |
|4.Respiratory system Earthworms do not have actually lungs. Lock breathe through theirskin. Oxygen and also carbon dioxide pass v the earthworm’s skin bydiffusion. For diffusion to occur, the earthworm’s skin must be keptmoist.Body fluid and also mucous is released to keep its skin moist. Earthwormstherefore, should be in damp or moist soil. This is one reason whythey usually surface ar at night when it is possibly cooler and the“evaporating potential that the wait is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capacity to finding light even though they cannot see. Theyhave tissue situated at the earthworm’s head the 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. || |
|EarthwormReproduction Earthworms space hermaphrodites where each earthworm containsboth male and female sex organs. The male and female sex organs canproduce sperm and also egg respectively in every earthworm. Althoughearthworms space hermaphrodites, many need a mate come reproduce. Duringmating, two worms line up inverted indigenous each various other so sperm have the right to beexchanged. The earthworms each have two male openings and two spermreceptacles, which take in the sperm from an additional mate. The earthwormshave a pair the ovaries that develop eggs. The clitellum will kind aslime tube roughly it, which will certainly fill through an albuminous fluid. Theearthworm will relocate forward the end of the slime tube. As the earthwormpasses v the slime tube, the tube will pass over the woman porepicking increase eggs. The pipe will proceed to relocate down the earthworm andpass end the male pore referred to as the spermatheca which has actually the storedsperm dubbed the spermatozoa. The eggs will fertilize and also the slimetube will close off together the worm moves totally out that the tube. Theslime pipe will form an “egg cocoon” and also be put into the soil. |
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Thefertilized eggs will certainly develop and also become young worms.