Honors Biology: Roundworms (continued)
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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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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

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.


Roundworms continued1

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.


Roundworms continued2

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”)


Roundworms continued3

Roundworms: continued

Review of structure (physiology)

  • The roundworm’s outer body (ectoderm) is “unsegmented”… which means it is smooth & without any rings or segments.


Roundworms continued4

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).


Roundworms continued5

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.


Roundworms continued6

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)


Roundworms continued7

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.


Roundworms continued8

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


Roundworms continued9

Roundworms: continued

  • Four major types of roundworms:

  • Roundworms are classified as being:

  • Trichinosis-causing;

  • Filarial;

  • Ascarid;

  • Hook.


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