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13 Cards in this Set
- Front
- Back
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Flatworms General Info: |
They live in oceans, on land, and inside of organisms. They have bilateral symmetry. They have an organ level of organization. They also have cephalization. They have a GVC. |
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Flatworms Germ Layers: |
In order of outside to inside: Ectoderm Mesoderm (Muscle, excretory, digestive, nervous and reproductive tissues develop from this layer) Endoderm They are triploblastic. |
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Flatworms Anatomy: |
On their head they have eye spots which only detect light. They also have a cluster of nerves there along with chemical receptors. They eat by extending their pharynx (basically an elephant trunk). They move by gliding on mucus using their ciliated epidermis. They have a GVC and no specialized respiratory or circulatory systems as they do this through diffusion. |
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Flatworm Digestion: |
The pharynx sucks in food which is then distributed into five branches of the GVC so nutrients go to all parts of the body. |
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Flatworm Movement: |
They secrete mucus then use their cilia to glide. |
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Flatworm Reproduction: |
They function as both sexes. Flatworm that injects sperm first becomes the father while the other becomes the mother. |
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Roundworms General Info: |
Nematoda means thread in Greek. First animals to have a digestive tract. They live in soil and other organisms. There are 25,000 species of nematodes and 500,000 possible species. |
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Roundworms Anatomy: |
They have a tube within a tube body plan so they have a separate mouth and anus. They still have a pharynx but now it is where a mouth would be. They also have a small brain. Their pseudocoelum houses some of their organs and can also distribute nutrients and act as a hydrostatic skeleton. They also have a cuticle which is several layers of hard material covering the body. Also they still use diffusion for respiration and circulation. |
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Roundworms Digestion: |
Roundworms take food into their mouth, then it is processed through their digestive tract until it reaches their anus. |
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Segmented Worms Anatomy: |
Their body is divided up into little segments. These segments allow for a hinged hydrostatic skeleton. Each segment contains its own set of organs. They also have a true coelum in contrast to roundworms. Yet again the coelum acts as a hydrostatic skeleton and can cushion the organs. |
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Segmented Worms Movement: |
Segmented Worms move by contracting and expanding different muscles groups. One group is small narrow rings around the muscle. The other is large bands around the muscle. If one is working the other won't. |
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Segmented Worms Embryonic Development: |
A Segmented Worm embryo with develop the blastospore into a mouth. Humans on the other hand will turn it into an anus. |
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Earthworms General Info: |
They breathe through their skin using diffusion because their blood vessels are so close to the surface. They have a crop which acts as storage and a gizzard which mechanically breaks down food. Their pharynx is positioned just before their mouth and they have an esophagus. |
