Parasitology Lifecycles Exam 2
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12 Terms
Schistosoma Spp.
Schistosoma Spp. Step 1
Eggs are shed from an infected human in feces (mansoni and japonicum) or urine (haematobium)
Schistosoma Spp. Step 2
Under appropriate conditions in water the eggs hatch and release miracidia
Schistosoma Spp. Step 3
The miracidia swim and penetrate snail tissue
Schistosoma Spp. Step 4
Sporocysts develop in the snail (2 generations)
Schistosoma Spp. Step 5
Free swimming cercariae are produced and released from the snail into the water
Schistosoma Spp. Step 6
Cercariae penetrate the skin of the human host
Schistosoma Spp. Step 7
Cercariae lose tails during penetration and become schistosomulae
Schistosoma Spp. Step 8
The schistosomulae circulate to the lungs, heart, and develop in the liver
Schistosoma Spp. Step 9
Schistosomules migrate to the portal blood in the liver and mature into adults
Schistosoma Spp. Step 10 (mansoni and japonicum)
Male and female adult worms copulate and reside in the mesenteric venules of bowels or rectum (laying eggs that circulate to the liver and shed in stools)
Schistosoma Spp. Step 10 (haematobium)
Male and female adult worms copulate and reside in the venous plexus of the bladder (eggs shed in urine)