Parasite lecture exam #3
Terms in this set (30)
Receptor & nerve at anterior end of bilateral organism. Can react when something touches any part of the body.
Produced by the adult hermaphroditic fluke has an operculum door (hatch) the operculated egg contains embryonic or developing fluke
Emerge from the hatch are triangular shaped and a broad anterior end. Covered with tiny cilia and the anterior has a spine to puncture the 1st intermediate host the snail
In the snail what happens to miracidium
Loose the cilia and develops into the nest stage (sporocyst)
Sac like structure
Within the sporocyst, germinal cells multiply and become rediae. They have oral sucker, intestine and birth pore. Develops into cercariae
Cercariae are where
Emerge through snails skin and into the outside environment
How do cercariae move
Tail for propelling itself through the water
What are the 3 options for cercariae
1. Penetrate or be ingested by 2nd intermediate host. 2. Drop tail, attach to vegetation and become encysted - infective stage metacercaria
3. Penetrate the primary host
Excysts in the intestine of the host and migrates to the adult habitat and develops into an adult fluke. The hermaphroditic adult fluke produces operculated eggs
"Lung fluke of dogs and cats"
"Salmon poisoning fluke"
"Common liver fluke of cattle"
"Deer liver fluke"
"The lancet flukes of ruminants"
Posses one flagellum, pear shaped, swim with their hosts body fluids with little resistance
Parasitize the GI and reproductive tract
Colonize the liver tissue of poultry
Organisms found in the circulating and peripheral blood
Pseudopodia (false feet), blob like shape
Outer body covered with tiny hairs
Locomotory organelles are internal
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