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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. 4. Body cavities:. Meaning space Exist in between the gut & body wall of most bilateral animal Has unique tissue lining; peritoneum. Peritoneum; encloses organs in the coelom. Coelom. Type of body cavity found in most bilateral animals

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. 4. Body cavities: • Meaning space • Exist in between the gut & body wall of most bilateral animal • Has unique tissue lining; peritoneum. • Peritoneum; encloses organs in the coelom.

  3. Coelom • Type of body cavity found in most bilateral animals • Key component in the larger & more complex animals. • Less complex invertebrates do not have body cavity (coelom), tissues fill the regions between gut and body wall. • Protects the internal organs from shocks as they are cushioned in the coelomic fluid. • Internal organs are free to move, grow and develop independently of the body wall.

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