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parasitology epithelial tissue tissue types helminthology class trematoda cartilage connective tissue strongylodies stercoralis hook worms nematodes ascariasis ascaris lumbricodies nematode tissue biolog disaese protozoa parasite parasitology classes host and its types types of parasitology parts of nervous system neuron types neuron nervous system muscle function muscle types muscle muscular tissue blood cells blood functions blood tissue bone functions bone classification bone fasciola hepatica