1. PLATYHELMINTHES REVIEW

2. 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

3. 2. monoceious Hermaphrodite
Male and females reproductive organs are in the same body

4. 3. Flame cells Excretory organ of platyhelminths
Maintains water balance

5. 4. Scolex
Hooks
Head of tapeworm
Has hooks & suckers
Suckers

6. 5. Why do parasitic worms lack a complex digestive system?
They feed off the food already digested by the host.

7. 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

8. 7. 4 senses of planarians
Sight (sense light)
Smell
Touch
Taste

9. 8. 6 characteristics of flatworms
Acoelomate
Cephaization
Triploblastic
Protostome
Bilateral symmetry
Rely on diffusion for excretion, respiration, circulation

10. 9.Explain & draw planarian reproduction
Cells divide to regrow lost body parts

11. 10. 2 terms for hosts
Intermediate
Primary

12. 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

13. 12. How do tapeworms differ from flatworms?
Lack eyespots
Lack mouth/pharynx
No gastrovascular cavity
No other digestive organs

14. 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

15. 14. Organs infected by flukes
Liver
Kidney
Blood
Lung

16. 15. What is the most dangerous fluke to infect a human?
Blood fluke

17. 16. Signs & symptoms of a porkworm that has formed cysts in the brain
Seizures
Hallucinations
Coma
Death

18. 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

19. 18. Id 4 symptoms of a tapeworm
Digestive probs
Weight loss
Lack of energy
Anemia

20. 19. Flatworms are the first to show what?
Bilateral symmetry
Cephalization

21. 20. What happens if you come in contact with tapeworm eggs in feces?
Causes cysts in tissues

22. 21. What happens when you ingest cysts of tapeworm in undercooked pork?
You get the worm in your gut

23. 22. How many people are infected with the tapeworm?
50 million

24. 23. What medicine is given to kill a tapeworm?
Albendazole

25. 24. How many people are infected with Schistosomiasis worldwide?
200 million