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worms
Worms-cfhs
| Question | Answer |
|---|---|
| Unsegmented and segmented worms - name the 3 layers. | *a. ectoderm(outside, *b.endoderm(inside) *c.mesoderm-inner, gives rise to internal organs |
| What does coelom mean? | the body cavity which contains organs |
| What does acoelomates mean? | There is no body cavity. (Without coelom) Flatworms are known as this. |
| What is cephalization? | formation of a primitive brain(ganglia) |
| *Phylum Platyhelminthes | unsegmented worms, *bilateral symmetry, *acoelomates, and called *flatworms |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | will regenerate or grow new partsw because it does not have a circulatory system |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | has a ganglia-cluster of nerve cells |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | free-living, most live in marine or fresh water, vary in color, form, and size |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | mouth and anus are the same opening |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | flame cells-remove excess water, excretory system |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | Hermaphronditic -both male and female reproductive parts |
| *Class Turbellaria-planarians (in the phylum Platyhelminthes) | eyespots-sensitive to light |
| *Class Trematoda- flukes (int the phylum Platyhelminthes) | parasitic (most flukes infect the internal organs of their host-they can infect the blood |
| *Class Trematoda- flukes (int the phylum Platyhelminthes) | uses suckers to cling to host |
| *Class Trematoda- flukes (int the phylum Platyhelminthes) | Shistosoma-name of blood fluke it can cause a serious disease in humans |
| *Class Trematoda- flukes (int the phylum Platyhelminthes) | hermaphroditic(both male and female reproductive parts) |
| Class Cestoda -tapeworms | Parasitic digestive system is simple, lives inside the intestines of the host |
| Class Cestoda -tapeworms | scolex-head structure with hooks and suckers that attach to the intestinal wall of it's host to absorb nutrients |
| Class Cestoda -tapeworms | hermaphroditic |
| Class Cestoda -tapeworms | can be prevented by inspecting and cooking meat |
| phylum Nematoda | unsegmented roundworms with bilateral symmetry, *pseudocoelomate-false coeloma(body cavity), all parasitic and 2 openings, * poor digestive system |
| Ascaris | Roundworm - (phylum Nematoda) is its common name, *lives in intestines of host |
| Hookworm | phylum Nematoda, found in soil, enters body by boring through soles of feet |
| Trichina or Trichinella | phylum Nematoda, *causes trichinosis, *found in undercooked pork, *forms cyst in muscle tissue (is eaten by animal - attaches to intestine, egg is produced and larvae attached into muscle, when eaten by human, larvae attaches to intestine and cycle begins |
| Wucheria | phylum Nematoda,causes elephantiasis by blocking lymph vessels |
| Guinea | phylum Nematoda, found under skin, *to be removed, it is pulled out by winding around a rock |
| Pinworm | phylum Nematoda, lays eggs around anus, symptoms include itching, sleeplessness and nervousness |
| phylum Annelida | segmented worms, bilateral, cephalization |
| Class Oligochaeta -earthworms (phylum Annelida) | "nature's plow" that provide tunnels for plant roots and water, castings feces - help seeds grow, fertilizer |
| Class Oligochaeta -earthworms (phylum Annelida) | ganglia - part of nervous system |
| Class Oligochaeta -earthworms (phylum Annelida) CLITELLIUM | picks up eggs and forms cocoon |
| Class Oligochaeta -earthworms (phylum Annelida) AORTIC ARCHES | 5 hearts |
| Class Oligochaeta -earthworms (phylum Annelida) SETAE | bristle like structures for movements |
| Class Oligochaeta -earthworms (phylum Annelida) GIZZARDS | grinds food |
| Class Oligochaeta -earthworms (phylum Annelida) | has a coelom (body cavity) |
| Class Oligochaeta -earthworms (phylum Annelida) NEPHRIDIA | part of excretory system that removes nitrogenous wastes |
| Class Polychaeta | marine/tube/sand worms - *breathe through gills |
| Class Hirudinea | *Leeches - *salivary glands produce anti-clotting substance *used to cure a black eye(bruise) *external parasite |
Created by:
barbara2
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