Class Trematoda - and swim about until they detect and...

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Class Trematoda The class Trematoda includes flukes. Flukes, such as blood, liver, and lung flukes are named after the organs they inhabit. Fluke bodies tend to be oval and elongate. They lack a definite head but have an oral sucker surrounded by sensory papillae. Flukes have reduced digestive, nervous, and excretory systems. Reproductive systems are well developed and usually hermaphroditic. The blood fluke, shown in Figure 20, causes schistosomiasis, a disease found predominantly in tropical Africa and South America. Unlike most flukes, blood flukes are male or female. Flukes deposit eggs in blood vessels around the host's intestine. The eggs migrate to the intestine and are passed out with feces. Larvae hatch in water
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Unformatted text preview: and swim about until they detect and enter a particular species of snail. The larvae reproduce asexually and eventually leave the snail. Once larvae penetrate human skin they begin to mature in the liver, and implant in blood vessels of the small intestine . A weakened person is then more likely to die from secondary diseases. The Chinese liver fluke, shown in Figure 21, requires two intermediate hosts. Humans become infected when they eat uncooked fish. Adults migrate to the liver and deposit eggs in the bile duct, which carries the eggs to the intestine. The larval flukes must then pass through two intermediate hosts, a snail and a fish....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Class Trematoda - and swim about until they detect and...

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