UNIT 2 - WORMS

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Across
  1. 3. the excretory organ of many invertebrates
  2. 6. one of the hollow cells terminating the branches of the excretory tubules of certain invertebrates, having a tuft of continuously moving cilia.
  3. 9. A disease caused by a parasitic blood fluke. It is transmitted to humans through feces-contaminated fresh water or snails. Symptoms include pain, anemia, and malfunction of the infected organ.
  4. 12. The nerve cell clusters that act like a brain for some invertebrates.
  5. 15. An individual in which reproductive organs of both sexes are present.
  6. 16. The head of a tapeworm with hooks and suckers to latch on to the tissues of the host.
  7. 17. an infolding along the innerwall of the intestine that increases surface area to aid in absorption of food.
  8. 20. This organ stores food that has entered through the esophagus.
  9. 21. bristle or bristlelike part that extend from some organisms.
  10. 22. The outer layer of a parasitic invertebrate that counters the host’s defenses.
Down
  1. 1. The body section of a tapeworm that contains the reproductive organs.
  2. 2. The waxy and waterproof outermost layer of earthworms.
  3. 4. A host that provides food to an immature parasite.
  4. 5. The part of the earthworm that secretes a cocoon in which the eggs and sperm are deposited for fertilization and development.
  5. 7. A saclike organ in the earthworm that stores the sperm.
  6. 8. The tube that connects the mouth to the esophagus. Or in the case of planaria this is used to eat their food.
  7. 10. The host that an adult parasite feeds on. This host is where reproduction occurs.
  8. 11. A disease caused by a parasitic roundworm that is transmitted to humans by eating undercooked meat. Symptoms include fever, muscle weakness, and diarrhea.
  9. 12. A carbohydrate that forms the exoskeleton in several invertebrates.
  10. 13. This organ grinds up food material.
  11. 14. 5 pairs of muscular tubes that force blood through the circulatory system of an earthworm.
  12. 18. Flap of skin overhanging the earthworm’s mouth. It protects the mouth and aids in senses to vibration and light.
  13. 19. The dividing wall for each segment within the earthworm.