Transcript PLATYHELMINTHES REVIEW

PLATYHELMINTHES
REVIEW
1. Penis Fencing
• Male & reproductive organs are in same body of planarians
• 2 planarians “joust or fence” to deliver sperm on the skin of mate
• Whoever receives sperm first becomes mother
2. monoceious
• Hermaphrodite
• Male and females reproductive organs are in the same body
3. Flame cells
• Excretory organ of platyhelminths
• Maintains water balance
4. Scolex
• Head of tapeworm
• Has hooks & suckers
Suckers
Hooks
5. Why do parasitic worms lack a complex
digestive system?
• They feed off the food already digested by the host.
6. Explain why directional movement is
correlated with cephalization.
• Having a brain with sensory organs allows organisms to move with a
purpose in a certain direction
7. 4 senses of planarians
• Sight (sense light)
• Smell
• Touch
• Taste
8. 6 characteristics of flatworms
• Acoelomate
• Cephaization
• Triploblastic
• Protostome
• Bilateral symmetry
• Rely on diffusion for excretion, respiration, circulation
9.Explain & draw planarian reproduction
• Cells divide to regrow lost body parts
10. 2 terms for hosts
• Intermediate
• Primary
11. Schistosomiasis
• Caused by parasitic blood fluke – schistosome
• Infects people in Asia, Africa & South America
• Mainly prevalent in unsanitary conditions
• Causes intestinal bleeding and tissue decay
• Massive buildup can cause cancer
• Snail is intermediate host
• Human is primary host
12. How do tapeworms differ from
flatworms?
• Lack eyespots
• Lack mouth/pharynx
• No gastrovascular cavity
• No other digestive organs
13. Life cycle of tapeworm
• Mature proglottids released in feceseggs are ingested by grazing
animalseggs hatch into larvalarva infect muscle tissue of animal
& form cystshuman becomes infected from eating undercooked
meat
14. Organs infected by flukes
• Liver
• Kidney
• Blood
• Lung
15. What is the most dangerous fluke to
infect a human?
• Blood fluke
16. Signs & symptoms of a porkworm that has
formed cysts in the brain
• Seizures
• Hallucinations
• Coma
• Death
17. How do lung flukes spread so rapidly?
• Cause inflammation in the lungs which causes the person to cough up
blood contaminated with eggsthe blood is reswallowed & eggs are
passed out in feces
18. Id 4 symptoms of a tapeworm
• Digestive probs
• Weight loss
• Lack of energy
• Anemia
19. Flatworms are the first to show what?
• Bilateral symmetry
• Cephalization
20. What happens if you come in contact with
tapeworm eggs in feces?
• Causes cysts in tissues
21. What happens when you ingest cysts of
tapeworm in undercooked pork?
• You get the worm in your gut
22. How many people are infected with the
tapeworm?
• 50 million
23. What medicine is given to kill a
tapeworm?
• Albendazole
24. How many people are infected with
Schistosomiasis worldwide?
• 200 million