In your own words, describe information from Figure 4.2. Give examples of different organisms covered in lab that fall into each category (you can exclude deuterostomes, since we cover that in the next lab). BODY CAVITIESDuring embryonic development of triploblastic animals, the development of the three embryoniclayers can occur differently, leading to animals that are acoelomate, pseudocoelomate, orcoelomate. Acoelomate animals, such as flatworms, lack a body cavity, scientifically referred to as acoelom. Pseudocoelomate animals, such as round worms, have a fluid-filled body cavity separatingthe gut from the body wall, but only the body wall is lined with mesoderm. In coelomate animals,adults have a body cavity where the organs are suspended by mesentery membranes, and both theorgans and the body cavity are completely lined with mesoderm. These types of body cavities areillustrated in Figure 4.2.EctodermEctodermEctodermMesodermMesodermMesodermEndodermCoelomEndodermPseudocoelomEndodermDigestivecavityDigestivecavityDigestivecavityAcoelomatePseudocoelomateCoelomateThree-layered,no coelomThree-layered,pseudocoelom(nematodes, etc.)Three-layered, coelom(mollusks, annelids,arthropods, chordates, etc.)(flatworms, ribbon worms)Figure 4.2. Different types of animal body coeloms.Laboratory 4 Invertebrate Zoology75Obluedoor, LLC

Answered: BODY CAVITIES During embryonic…

Human Anatomy & Physiology (11th Edition)

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ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

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Chapter1: The Human Body: An Orientation

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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In your own words, describe information from Figure 4.2. Give examples of different organisms covered in lab that fall into each category (you can exclude deuterostomes, since we cover that in the next lab).

BODY CAVITIES
During embryonic development of triploblastic animals, the development of the three embryonic
layers can occur differently, leading to animals that are acoelomate, pseudocoelomate, or
coelomate. Acoelomate animals, such as flatworms, lack a body cavity, scientifically referred to as a
coelom. Pseudocoelomate animals, such as round worms, have a fluid-filled body cavity separating
the gut from the body wall, but only the body wall is lined with mesoderm. In coelomate animals,
adults have a body cavity where the organs are suspended by mesentery membranes, and both the
organs and the body cavity are completely lined with mesoderm. These types of body cavities are
illustrated in Figure 4.2.
Ectoderm
Ectoderm
Ectoderm
Mesoderm
Mesoderm
Mesoderm
Endoderm
Coelom
Endoderm
Pseudocoelom
Endoderm
Digestive
cavity
Digestive
cavity
Digestive
cavity
Acoelomate
Pseudocoelomate
Coelomate
Three-layered,
no coelom
Three-layered,
pseudocoelom
(nematodes, etc.)
Three-layered, coelom
(mollusks, annelids,
arthropods, chordates, etc.)
(flatworms, ribbon worms)
Figure 4.2. Different types of animal body coeloms.
Laboratory 4 Invertebrate Zoology
75
Obluedoor, LLC

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NOTE:- "As you haven't mentioned the examples of organisms that are covered in your lab so we will provide examples on our own for each coelom".

The main body cavity is the coelom in the animals that lies between the outer body wall and the gut.

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