Intro to Animals (ch. 33) Flashcards
Which is NOT a characteristic of an animal? multicellular, heterotrophic, cell walls, motile
cell walls
What is the origin of multicellularity?
Choanoflagellates, from Opisthokonta
Evolutionary step process: tissues, body ____, and ___.
Tissues, body symmetry and coelom
What is tissue?
formation of cells of different types; have a single structure/function
Tissue origin/Embryonic tissue layers: diploblastic, ___blastic
triplo
Germ layers: ___derm, mesoderm, ___derm
ectoderm, mesoderm, endoderm
Diploblasts have what two germ layers?
Ecto and endoderm
Triploblasts have what three germ layers?
Ecto, endo and mesoderm
The mesoderm is where these things are located: Muscle, ____ system, Skeletal ____.
Musicle, Circulatory System, Skeletal system.
What organisms have radial symmetry?
Ctenophores, cnidarians and echinodermata
What organisms have bilateral symmetry?
Anthropodes, Platyhelminthes, nematodes, etc.
What is this process called?
“The formation in animals of a distinct anterior region where sense organs (brain) and a mouth are clustered.”
Cephalization
What is a coelom? An internal ____ - filled body cavity that is completely (or partially) lined with ____.
fluid, mesoderm
How do we classify animals according to coelom?
acoelomate, psuedocoelomate and true coelomate
What is pseudocoelomate?
A pseudocoelomate has coelom without mesoderm lining. (nematodes).
Can you think of an animal that is a acoelomate?
Flatworms (platyhelminthes)
Name this: The initial pore (blastopore) becomes the mouth. The anus forms later. The mesoderm blocks form in addition or separate from the gut; coelom cavities form within the mesoderm blocks
Protostome
Name this: The initial pore (blastopore) becomes the anus. The mouth forms later. The mesoderm blocks form on either side of the gut and pinch off later forming coelom.
Deuterostome
Name a phylum for multicellular only
Porifera (sponges)
Are sponges bilateral or radial?
Neither. They are asymmetrical.
Name two phylum that are diploblastic.
Ctenophora and Cnidaria
Porifera (sponges) lack tissues, symmetry, internal ____. Adults are sessile while the larvae are _____.
skeleton, motile
Cnidaria (anemones, coral, hydra, jellies) have ____ symmetry and are diploblastic.
radial
