sheep liver fluke fasciola hepatica and structure of human digestive system. location of helminth in body

anatomy animal appendix ascending background biology bladder body cecum colon descending digestion digestive duodenum educational fasciola flatworm fluke gall gallbladder gastrointestinal glands health helminth hepatica human ileum illustration intestine invertebrate isolated jejunum large liver medical medicine organ organs pancreas parasite parasitic part pest physiology rectum salivary scheme science sheep sigmoid small stomach structure system tongue tract transverse trematoda trematode vector white worm zoology