| Term | Definition |
|---|
| Phylum Platyhelminthes | (Flatworms) many are parasites |
| Acoelomates (flat) | Platyhelminthes have what kind of a body structure? |
| bilateral symmetry | Platyhelminthes have what kind of symmetry? |
| triploblastic (3 layers) | Platyhelminthes have what type of germ layers? |
| gut with a single opening | Platyhelminthes have what kind of a gut? |
| Characteristic - Body structure/ development | Acoelomates (flat); bilateral symmetry; triploblastic (3 germ layers), gut with a single opening |
| Characteristic - Circulatory System | Diffusion |
| Characteristic - Respiratory System | Diffusion across a moist surface |
| Characteristic - Movement | Cilia, muscle cells, twist and turn |
| Characteristic - Digestive System | Gut with a single opening - phyranx = moth/anus |
| Phyranx | gut with a single opening (mouth/anus) |
| Characteristic - Excretory System | Excretes ammonia into water (e.g. flame cells in planaria) |
| ammonia | What is excreted into the water? |
| Anterior | Posterior ladder like nerve cord with celebral ganglia (bundles of nerves) have eyespots sensitive to chemicals, can sense vibrations |
| Nervous System | Anterior - Posterior ladder like nerve cord with celebral ganglia (bundles of nerves) have eyespots sensitive to chemicals, can sense vibrations |
| Class - Turbellaria | Most live in oceans, free living organisms |
| Turbellaria | Example: Freshwater free living flat worm |
| Turbellaria - digestion | Scavengers of decaying plant and animal matter |
| Pharynx | Turbellaria ingest food through their muscular tube AKA their? |
| Branched Gastrovascular Cavity | What does the Turbellaria's pharynx lead to? |
| Excretory System | living in fresh water presents problems...osmosis - Turbellaria |
| Excretory tubules | What do Turbellaria eliminate excess water through? |
| The course of their body | IN Turbellaria's excretory tubules run where? |
| flame cell | Each excretory tubule in Turbellarias are connected to a what? |
| flame cell | Enclose tufts of beating cilia which resemble a flame |
| water | flame cells collect excess what? |
| excretory tubules; pores | the excess water is transported through what to the what? |
| Outside the planaria's body | Where are the pores on flame cells? |
| Pores | Where does water exit in a Turbellaria's excretory system? |
| Cerebral Ganglia | In the nervous system the anterior end has a what? |
| Cerebral Ganglia | Clusters of nerve cells |
| Muscle tissue | the ladder like nervous system of sensory feed what in the nervous system |
| Sensory cells | the nervous system consists of what kind of cells that respond to touch, smell, current, etc. |
| eyespots | the nervous system has what? |
| Cestoda | Tapeworms (parasites) 5,000 different species |
| Tegument | tough outer layer that protects the organism from digestive enzymes and body's immune system |
| Scolex | found at the anterior end: knob shaped organ adorned by hooks and suckers used to attach the animal to its host |
| short neck | growth occurs here |
| Proglottids | Body sections |
| Proglottids | what breaks off and fertilizes the eggs an are passed on to feces |
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