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11 Cards in this Set
- Front
- Back
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Characteristics of Phylum Platyhelminthes?
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-Acoelomate (no true body cavity)
-Bilateral symmetry -Dorsal Flattening -Well developed organ system -UNSEGMENTED -Triploblastic |
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3 Tissue layers of Platyhelminthes?
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Endoderm, Ectoderm, Mesoderm
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Ectoderm becomes?
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Epidermis
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Endoderm becomes?
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Gastrodermis.
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Mesoderm becomes?
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Becomes muscles and other
internal organs and fills the body of the Platyhelminthes |
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Nervous System of a flatworm?
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Looks like a ladder, made up of brain, two lateral nerve cords, and sensory nerves.
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Muscle System of Flatworm?
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The muscle system in Dugesia:
The cutaneous musculature consists of a layer of circular muscles that lies directly below the epidermis and an inner layer of longitudinal muscles plus dorso ventral muscle bundles. |
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The Digestive System of a Flatworm?
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The digestive cavity of
Dugesia is a single-entry gastrovascular cavity similar to the GVC of Hydra except that in Dugesia it is highly branched. |
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Feeding of a Flatworm?
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The pharynx is normally carried inside the
body, but during feeding, the pharynx everts and sucks food into the gastrovascular cavity of Dugesia- into where extra cellular digestion takes place. |
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The Excretory System of the Flatworm?
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Waste Material is dissolved in water and flows into tubules. Waste material is then pumped out of the body by pumps called flame cells.
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Reproductive system in a flatworm?
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A single individual animal contains both male testes and female ovaries. Fertilization usually takes place btwn two individuals who exchange sperm. Can also reproduce asexually by means of regeneration.
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