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Simple Invertebrates

7th grade chapter 15 holt textbook

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
Created by: daisy.diesel