BIO 2135 Lecture Notes - Lecture 10: Rhopalium, Mesoglea, Hydrozoa
12 Oct 2017
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Gap junctions important for sending electrical, hormonal signals. Radial - oral to aboral side cut and cuts can be made all around. Bilateral - only cut down one direction, left and right, top bottom, symmetrical. Radiata are close to the number of the parazoa but not quite equal. Not a lot of integration of sensory information, they just act on impulse and instinct. Nematocyst is essentially a spring that is tightly suppressed. Nematocyst uncoils with enough force to penetrate the exoskeleton of arthropods. At it"s tip (of the tentacle) are usually poisons that causes prey to become paralyzed. Blastula will then invaginate to become a blastopore (sp?) The outer layer is then the gastrula and the inner layer is the gut. Epitheliomuscular cells line epithelium, can contract, run the length of the body. Nutritive muscular cells line the gastrovascular cavity , they run along the circumference of the body (circular) Found in every single cnidarian development sequence.
