Characteristics of animals Feeding- Must consume food. Does not produce it’s own food....
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Transcript of Characteristics of animals Feeding- Must consume food. Does not produce it’s own food....
Characteristics of animalsFeeding- Must consume food. Does not produce
it’s own food. Heterotrophic Respiration- Takes in oxygen and gives off CO2Circulation-Has a means to distribute O2 Excretion- Means to eliminate wasteResponse –Respond to environment using
specialized cellsMovement-Able to move from one place to
another. MobileReproduction- Able to reproduce sexuallyEukaryotic- Cell with cell membrane and true
nuclei.
Development of animals1. Fertilization- sperm and egg join together (1n+1n=2n) 2. Mitosis of 2n cell = 2 cells, 4 cells, 8
cells,.16…32……. 3. Now get a hollow ball of cells called a
BLASTULA that is filled with fluid4. One side of blastula pinches inward to form
GASTRULA 5. Hole that forms is called BLASTOPORE
BLASTULA GASTRULA
Animals Grouped by Fate of Blastopore Depending on what becomes of blastopore animals
are divided into 2 groups
1. blastopore becomes mouth- PROTOSTOME(then second opening becomes anus)
2. blastopore becomes anus –DEUTEROSTOME(then second opening is mouth)
Cells then differentiate for animal to reach adulthood.
Gastulation is what forms an inside and an outside of the organism.
Inside layer called ENDODERM-becomes lining of the gut
Outside layer of cells called ECTODERM-becomes skin and nervous system
Some animals have a 3rd middle layer called MESODERM-becomes the circulatory system, muscle system, and excretory system
SymmetryAnimals can be divided into groups by their
symmetry.
AsymmetryNo symmetryAsymmetricalsponges
Radial symmetryOrganism can be divided
along any planeJellyfish
Bilateral SymmetryOrganism has left and
rightAnterior and posteriorFront and BackVentral and Dorsal
Animals with 3 body layersAnimals with 3 body
layers(Ectoderm,Endoderm, and Mesoderm) can be divided into 3 groups depending on how much of their body cavity is covered by mesoderm.
Body cavity is called COELOME
AcoelomateNo body cavity.Digestive tract runs length of bodyFlatwormsSolid all the way through
Pseudocoelomate(false cavity)Space between endoderm and mesoderm is filled with
fluidCoelome not compltely covered by mesoderm, just
partially1 way digestive tractRound worm
Coelomate(true body cavity)True body cavity all surrounded by mesodermFluid filledContains specialized organsHumans, Earthworm