the animal kingdom. characteristics of animals eukaryotic multicellular reproduce specialized cells...
TRANSCRIPT
Characteristics of Animals• Eukaryotic• Multicellular• Reproduce• Specialized Cells• Heterotrophic (must obtain food)• Must Digest Food• Most animals move and have a fixed size in
the adult form
Classification of Animals
Symmetry:AssymetricalRadialBilateral
Body Cavity:AcoelomatePseudoceolomateCoelomate
Embryonic OpeningsProtostomeDeuterostome
Body Symmetry of Animals
Asymmetrycannot be divided into mirror images
Ex- sponges• Very simple
organisms• Believed this type of organism
evolved 1st
Radial Symmetry:can be cut in half along many planes that
allow for nearly identical halvesEx- Hydra: adaptation to be able to see prey coming at it from any direction
Bilateral Symmetry:a single plane divides body into two mirror
images
More complex organisms exhibit this kind of
symmetry
Proto/Deuterostomes • Deuterostomes
– Radial Cleavage– Blastopore becomes the __anus_____– Indeterminate Cleavage: which means early on in
development the fates of the cells are undetermined
• Protostomes-– Spiral Cleavage– Blastopore becomes the ____mouth___– Determinate Cleavage- which means that each cell of the
embryo has a fixed or determined fate.
AcoelomatesFLATWORMS (Phylum _________)May be the 1st organisms to evolve organs from mesodermSolid, compact bodyOrgans imbedded in the solid tissue of the body. first to have the three cell layers
Ecto/endo/mesodermHave a digestive tract (one way gut)
PseudocoelomatesRoundworms (Phylum _________)
Have a body cavityIt’s fluid-filled and partly lined with mesodermEnables animal to move more quickly
Muscles attach to the mesoderm and brace against the pseudocoelom
CoelomatesSegmented worms (Phylum ______)
Coelom provides space for development of organs/ organ systemsThis allows for membranes like the parietals and viscerals Have a TRUE body cavityCOELOM= fluid-filled space COMPLETELY surrounded by mesoderm.Coelom cushions and protects internal organs and provides room for them to grow and move independently
What type of symmetry is shown here?
33%
33%
33%
Bilateral Radial Asymmetry
1. Bilateral2. Radial3. Asymmetry
What type of symmetry is shown here?
33%
33%
33%
Bilateral Radial Asymmetry
1. Bilateral2. Radial3. Asymmetry
What type of symmetry is shown here?
33%
33%
33%
Bilateral Radial Asymmetry
1. Bilateral2. Radial3. Asymmetry
What type of symmetry is shown here?
33%
33%
33%
Bilateral Radial Asymmetry
1. Bilateral2. Radial3. Asymmetry
What type of symmetry is shown here?
33%
33%
33%
Bilateral Radial Asymmetry
1. Bilateral2. Radial3. Asymmetry