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Simple Invertebrates
7th grade chapter 15 holt textbook
Term | Definition |
---|---|
Invertebrates | Animals with no backbones |
Bilateral Symmetry | A body with two similar halves |
Radial Symmetry | Body parts are arranged in a circle around a center point |
Asymmetrical | Animals without symmetry |
Ganglia | Dozens of nerve cells together in groups |
Gut | A pouch lined with cells that release a powerful enzyme that breaks down food into small particles and absorbs it |
Coelom | A special space in the body for the gut |
Spicules | Most sponges have this skeleton made of needle like structures |
Regenerate | Replace it's body parts |
Collar cells | Line the central cavity of a sponge. Each collar cell filters particles of food from the water and digests them. |
Pore cells | Used to pump water into a sponge |
Osculum | The hole at the top of a sponge |