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Mr. Gibson Room 213 w/o May 9th

Honors Biology: Roundworms (continued) Feeding, Respiration, Circulation, Excretion, Response, Movement, Reproduction & Types. Mr. Gibson Room 213 w/o May 9th. Roundworms: continued. Review of structure (physiology).

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Mr. Gibson Room 213 w/o May 9th

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  1. Honors Biology: Roundworms (continued) Feeding, Respiration, Circulation, Excretion, Response, Movement, Reproduction & Types Mr. Gibson Room 213 w/o May 9th

  2. Roundworms: continued Review of structure (physiology) • They have a “hydrostatic skeleton” (water – not moving) due to a fluid filled gastrovascular cavity that contains NO complex digestive organs, but DOES have two openings – mouth & anus.

  3. Roundworms: continued Review of structure (physiology) • The “hydrostatic skeleton” is caused by the fluid inside the endoderm lined gastrovascular cavity pushing outward (like a water balloon does as is fills up). This outward force (by the fluid) is called tugor pressure.

  4. Roundworms: continued Review of structure (physiology) • In summary: The “hydrostatic skeleton” caused by the fluid filled endoderm lined gastrovascular cavity pushing outward as tugor pressure … […] classifies roundworms as pseudocoelomates. (“pseudo” = “like”)

  5. Roundworms: continued Review of structure (physiology) • The roundworm’s outer body (ectoderm) is “unsegmented”… which means it is smooth & without any rings or segments.

  6. Roundworms: continued • Reproduction • The roundworms are “male” and “female” (NOT hermaphrodites). • They rely on sexual reproduction. • More specifically, internal sexual reproduction (means the male’s sperm fertilized the female’s egg INSIDE her body).

  7. Roundworms: continued • Feeding • The roundworms’ mouth has “grasping mouth pieces” which means they can grip and hold onto their prey (host) as they feed off of them. • This also makes them parasitic heterotrophic carnivores.

  8. Roundworms: continued • Respiration, circulation, & excretion: • Like flatworms… roundworms use diffusion through their body walls [to] move gases & materials into/out of their cells. • They have no internal transport system (digestive system, blood circulatory system, or breathing system)

  9. Roundworms: continued • Response: • Roundworms… like flatworms have a simple nervous system consisting of the same: a) ganglia (nerve ring) b) ventral nerve chords (that run the length of the body) c) transverse nerves • They also have chemical & vibratory sensors for locating prey & predators.

  10. Roundworms: continued • Movement: • Roundworms have muscles that run the length of their bodies. • The fluid in the pseudocoelom combined with the muscles serve to expand & contract thus “move” the animal by “pushing” or “pulling” themselves along. http://animal.discovery.com/videos/monsters-inside-me-the-baylisascaris-parasite.html

  11. Roundworms: continued • Four major types of roundworms: • Roundworms are classified as being: • Trichinosis-causing; • Filarial; • Ascarid; • Hook.

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