Earthworm Anatomy 1. Segmented BodyEarthworms are classified in the phylum Annelida or Annelids. Annelidain Latin means, “little rings.” The body of the earthworm is segmentedwhich looks like many tiny rings join or fused together. Theearthworm is make of around 100-150 segments. The segmented human body partsprovide necessary structural functions. Segment can help theearthworm move. Each segment or section has muscles and bristles calledsetae. The bristles or setae help anchor and also control the worm whenmoving through soil. The bristles organize a section of the worm firmlyinto the ground if the other part of the body protrudes forward. Theearthworm uses segments to either contract or relax separately tocause the body to lengthen in one area or contract in various other areas.Segmentation helps the worm come be versatile and solid in the movement.If every segment moved together without gift independent, the earthwormwould it is in stationary.
2.Digestive device The digestive mechanism is partitioned into numerous regions, eachwith a details function. The digestive system consists 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 with the esophagus, which has actually calciferousglands that relax calcium lead carbonate to escape the earthworm’s body ofexcess calcium. After that passes through the esophagus, the food movesinto the crop where it is stored and also then eventually moves into thegizzard. The gizzard offers stones the the earthworm eats come grind thefood completely. The food moves into the intestines together gland cells inthe intestine release fluids to assist in the cradle process. Theintestinal wall contains blood vessels where the digested food isabsorbed and transported come the remainder of the body.
3.Circulatory System an additional important organ system is the circulatory system.The earthworm has actually a closed circulatory system. One earthworm circulatesblood specifically through vessels. There are three main vessels thatsupply the blood to organs in ~ the earthworm. These vessels space theaortic arches, dorsal blood vessels, and ventral blood vessels. Theaortic arches role like a human heart. There are five pairs ofaortic arches, which have actually the obligation of pumping blood into thedorsal and also ventral blood vessels. The dorsal blood vessels areresponsible for transferring blood come the prior of the earthworm’s body.The ventral blood vessels space responsible for delivering blood come theback that the earthworm’s body.
4.Respiratory device Earthworms do not have lungs. They breathe through theirskin. Oxygen and carbon dioxide pass through the earthworm’s skin bydiffusion. Because that diffusion come occur, the earthworm’s skin have to be keptmoist.Body fluid and also mucous is released to store its skin moist. Earthwormstherefore, have to be in damp or moist soil. This is one reason whythey usually surface at night as soon as it is possibly cooler and also the“evaporating potential of the air is low.”(www.amonline.net.au/factsheets/earthworms.htm) Earthworms havedeveloped the capacity to recognize light also though they can not see. Theyhave tissue located at the earthworm’s head the is sensitive to light.These tissues enable an earthworm to detect light and also not surfaceduring the daytime whereby they can be affected by the sun.
EarthwormReproduction Earthworms space hermaphrodites whereby each earthworm containsboth male and female sex organs. The male and also female sex organs canproduce sperm and egg dong in each earthworm. Althoughearthworms room hermaphrodites, most need a mate come reproduce. Duringmating, 2 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 create eggs. The clitellum will type aslime tube approximately it, which will certainly fill with an albuminous fluid. Theearthworm will move forward the end of the slime tube. Together the earthwormpasses v the slime tube, the tube will certainly pass over the woman porepicking up eggs. The pipe will proceed to move down the earthworm andpass end the male pore called the spermatheca which has actually the storedsperm dubbed the spermatozoa. The eggs will certainly fertilize and the slimetube will close off together the worm moves fully out of the tube. Theslime tube will kind an “egg cocoon” and also be put right into the soil.