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Body Cavities
- Coelomates
- Most triploblastic animals have fluid-filled body cavity
- Coelom: True body cavity
- derived from mesoderm
- Pseudocoelomates
- Triploblastic animals that lack mesoderm lining
- Have a hollow cavity, but it is not fully lined with mesoderm
- Aceolomates
- Triploblastic animals that lack a body cavity
Function of Coelom
- Coelom cushions internal organs from physical damage
- Allows organs to shift Examples: Gut digesting, heart beating etc.
- Some fluid filled cavities used as a hydrostatic skeleton
- Fluid is incompressible
- allows muscle to flex using the fluid as an anchor (instead of bones)
- Some animals lost / gained coelom cavities throughout evolutionary history
Germ Layer
Order these germ layers from inner-most to outer-most.
A. Mesoderm
B. Ectoderm
C. Outerderm
D. Endoderm
Mark Yourself Question
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- When you're done, check the "I have answered this question" box below.
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Mark Yourself Question
- Grab a piece of paper and try this problem yourself.
- When you're done, check the "I have answered this question" box below.
- View the solution and report whether you got it right or wrong.