Saturday, October 26, 2013

Molluscs to three different aquatic biomes.

Introduction: Molluscs are one of the most diverse groups of invertebrate fleshlys - some(prenominal) in form and habitat. Therefore the study of molluscs has captured the interest of amateur and scientists alike for many centuries they have figured prominently in paleobiological and biological studies, and have served as study organisms in many evolutionary, biomechanical, ecological, physiological, and behavioural studies (Little, 1990) Within the phylum Mollusca, snails and slugs make up the largest molluscan group, and have consequently been canvas most extensively. They are so named because their foot spreads tabu when the animal crawls about (Little C 1990). The cerebral ganglion of several species (e.g., Euhadra peliomorpha, genus Tethus californica, and Lymnaea stagnalis) secretes a neurohormone that stimulates the hermaphroditic sex gland (the reproductive secretory organ that contains both virile and female characteristics); hermaphroditism is a gross conditi on among molluscs. This gonadotrophic peptide hormone is stored in a regular(prenominal) neurohemal organ until its incommode is stimulated. For example, phototropic information detected by the questionable optical gland can direct the release of the gonadotrophic hormone. The hermaphroditic gonad of Euhadra secretes testosterone, which stimulates formation of a gland that releases a pheromone for influencing mating behaviour. The optic gland of the octopus (of the class Cephalopoda) influences developing of the reproductive variety meat on a seasonal basis. It is not known, however, whether any neurohormones are involved or whether this is rigorously a neurally controlled event.
bestessaycheap.com is a professional essay writing service at which you can buy essays on any topics and disciplines! All custom essays ar   e written by professional writers! All molluscs have a similar frame plan with three main part: *         a foot, *         a visceral hoi polloi, *         a mantle. The foot is utilise for movement, the visceral potful contains most of the internal organs, and the mantle is a heavy twist of tissue over the visceral mass from which a pillowcase may develop. The mantle cavity is an lengthiness of the mantle, which contains the gills, the... thanks for the hear it help me alot! i never really knew this overmuch compact but now i do! thanks If you close to get a full essay, order it on our website: BestEssayCheap.com

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