BIOL110 Study Guide - Planula, Cardiac Muscle, Motility
30 Nov 2014
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Mesoglea is a jelly like skeleton o uses the water in the gut cavity like a hydrostatic skeleton. Only cnidarians make cnidocytes cnidocytes are only used once cnidocil = trigger which is sensitive to touch not all cnidocytes contain nematocysts (the stinging) found in salt water, few in fresh. Firing nematocysts when nematocysts are disturbed the operculum opens up difference in solute (osmotic gradient) sucks water up, creating osmotic pressure tensional force brings water in and creates force too. 64*** zygote develops into motile planula larva this settles on hard surface and turns into a polyp polyp may make more polyps asexually or produce medusa by asexual reproduction medusa is the sexual stage of the cnidarian. Gastrovascular cavity o o o blind gut medusa have manubrium one opening, no mouth or anal end. Epitheliomuscular cells o o allows the medusa and polyps to travel around contracts to swim.
