Annelids

Body Plan Annelids halt a fluid-filled body colliery called a celoma that holds the guts and other organs of the organism. The coelom is get ahead split up into small compartments of walls called septa. Segmented wriggles atomic number 18 invertebrates, meaning they take no bones, but they do be in possession of obvious go that encircle their body, called annuli, combined and known as segments. Beneath distributively segment contains broadside vigors that hold up the bird louses structure. Beneath the snub layer of cuticle and epidermis is the circular and longitudinal pass that allows movement of the worm. When the two muscles contract, the circular muscle allows the body to deform thin, whereas the longitudinal allows the body to become short. If both(prenominal) the muscles move at the same time, then the worm exit only channelise in shape and size. However, the contraction and restful of a a few(prenominal) segments at a time allows the worm to move, rese mbling a wave. collapse like hairs on a worm is called the Setae, which is part of the longitudinal muscle, allowing the worm to pull itself forward. The symmetry of a earthworm is similarly bilateral, meaning they can be divided into two distinguishable parts, with identical sides. This is because they have a abaxial and ventral surface, and a posterior and anterior end, with lateral sides.

  Earthworms do not have eyes, but they do have light-sensitive cells scattered in their outer skin. This allows them to detect light intensity, forgather and chemicals. They also have five hearts, also known as the calcif erous glands, that controls the get along o! f calcium that the worm takes in. This is grand because the worm consume a large portion of soil for nutrients. Earthworms also have mere(a) brains that allow body movement in response to light. In fact, if the brain of a earthworm is removed, commonplace changes would b arely be noticeable.  Body Covering The skins of segmented earthworms are surrounded by annuli and hairlike vessels that allow the diffusion of group O into the skin. However, such...If you want to get a full essay, order it on our website: BestEssayCheap.com

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