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A human swallows tapeworm cysts when they eat the undercooked meat of the contaminated animal or the raw contaminated fish. The cysts hatch inside the human and develop into adult worms, which attach themselves to the wall of the intestines, grow in length and produce eggs.his is why symptoms of a tapeworm larvae infection are different to those of an adult tapeworm infection, which is confined to your intestines. Pork and beef tapeworms are more commonly found in developing areas of the world such as Africa, the Middle East, Eastern Europe, Southeast Asia, and Central and South America.
Bottom: longitudinal muscles contract in the left half of the worm and circular muscles contract in the right half of the worm.Annelid worms, such as ragworms, lugworms and earthworms have one important additional feature that enables them to gain fine control over their hydrostatic skeletons-intersegmental septa.o accomplish this, the neural foramen is surrounded by circular muscle fibres that form a sphincter. Contraction of these muscle fibres makes the foramen smaller, closing the seal, whilst relaxing the sphincter opens the foramen and allows coelomic fluid to pass from one segment to the next.