body cavity
DESCRIPTION
Body cavity. Acoelomates. FLATWORMS (Phylum _________) May be the 1 st organisms to evolve organs from mesoderm Solid, compact body Organs imbedded in the solid tissue of the body. first to have the three cell layers Ecto/endo/mesoderm Have a digestive tract (one way gut). - PowerPoint PPT PresentationTRANSCRIPT
Body cavity
Acoelomates• FLATWORMS (Phylum _________)• May be the 1st organisms to evolve
organs from mesoderm• Solid, compact body• Organs imbedded in the solid
tissue of the body.• first to have the three cell layers
• Ecto/endo/mesoderm• Have a digestive tract (one way
gut)
Pseudocoelomates• Roundworms (Phylum _________)
• Have a body cavity• It’s fluid-filled and partly lined
with mesoderm• Enables animal to move more
quickly• Muscles attach to the
mesoderm and brace against the pseudocoelom
Coelomates• Segmented worms (Phylum ______)
• Coelom provides space for development of organs/ organ systems
• This allows for membranes like the parietals and viscerals Have a TRUE body cavity
• COELOM= fluid-filled space COMPLETELY surrounded by mesoderm.
• Coelom cushions and protects internal organs and provides room for them to grow and move independently
ANIMAL PHYLA
AB C
1 2
3 4
5 6
7 8
109
Asymmetry
Acoelomates
Pseudo-coelomate Coelomates
This letter represents the asymmetrical animals on the phylogenetic tree
0%
0%
100%
AB C
1. A2. B3. C
This letter represents the animals that exist only at the cellular level of organization.
25%
0%
75%
AB C
1. A2. B3. C
This letter represents the bilateral animals on the phylogenetic tree
83%
17%
0%
AB C
1. A2. B3. C
Based on the tree, the phylum Annelida is most closely related to:
93%
0%0%
7%
AB C
1. Mollusca2. Cnidaria3. Chordata4. Arthropoda
Based on the phylogenetic tree, the term most likely to appear at location “B”
100%0%0%
0%
Pseudocoelomate
AB
1. Radial2. Acoelomate3. asymmetry4. coelomate
Ectoderm Endoderm Mesoderm Coelom
Do You Have A Cavity??? Digestive Tube
Based on the diagrams below, which organism is most likely to store eggs in its coelom?
26%
63%
11%
A B C
1. A2. B3. C