BIOL 1202 : Exam1Review Crousillac SI
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The ___mesoglea____ is the layer between the epidermis and endodermis. _____polyp_______form is generally sessile while ____medusa_______ form moves freely in water by drifting and contractions of the bell. __________cnidocytes__________ are unique cells that function in defense and the capture of prey. Trematoda (flukes) and cestoda (tapeworms) are usually parasites of _____________. The _____radula_____ is a rasp-like feeding organ that scrapes and scoops food items. Class ___gastropoda____________ (snails and slugs) have an asymmetrical body usually with a coiled shell. Mostly suspension feeders, class ____bivalvia____________ (clams, mussels, oysters) have a flattened shell with 2 valves and no radula. Class ________cephalopoda_________ (squids, octopods, cuttlefish) have a head surrounded by grasping tentacles, they may have a shell or not. The ____metarephridium___________ are excretory tubes that remove wastes from blood and coelomic fluid. Shedding of exoskeleton is a process called _____ecdysis______. Arachnids, of the phylum arthropoda, have 2 body regions, the _____abdomen________ and the. Cerebral ganglion and ___sensory organs_____________ are concentrated in the head.
