1 / 15

Animals

Animals. Multicellular Heterotrophic Lack cell walls Sexual Reproduction Movement Specialization – adaptation for a cell for a particular function Cells  tissues  organs  organ systems. Dorsal – top Ventral – bottom Anterior – head Posterior - Tail. Body Structure.

tavon
Download Presentation

Animals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Animals

  2. Multicellular Heterotrophic Lack cell walls Sexual Reproduction Movement Specialization – adaptation for a cell for a particular function Cells  tissues  organs  organ systems

  3. Dorsal – top Ventral – bottom Anterior – head Posterior - Tail Body Structure

  4. Asymmetry – no symmetry 23.2 Animal Diversity Body Symmetry • Radial – arrangement of body parts around a central axis • - top & bottom, no front, back, or right & left sides • Bilateral symmetry – 2 similar halves on either side of a central plane

  5. 23.2 Animal Diversity Radial Symmetry – allows for organism to take in stimuli from all sides

  6. 23.2 Animal Diversity Bilateral Symmetry – adaptation for movement

  7. concentration of sensory & brain structures in the anterior region 23.2 Animal Diversity Cephalization No-cephalization

  8. Gamete + Gamete = Zygote Sperm membrane fuses with egg membrane causes an electrical shock that blocks entry by other sperm Sperm nucleus merges with egg nucleus 23.2 Animal Diversity Fertilization

  9. Rapidly increases # of cells, but cells do not grow in size Increases surface area-to-volume ratio Continues until they form a hollow ball of cells – blastula Central cavity - blastocoel 23.2 Animal Diversity Cleavage – cell divisions of the zygote immediately following fertilization

  10. Blastopore – infolded region - will function as the gut Gastrula – multilayered embryo Deep cavity is formed – archenteron – embryonic stem cells Ectoderm – outer germ (cell) layer Skin, hair, etc. Endoderm – inner germ layer Digestive system Mesoderm – layer between ectoderm & endoderm Muscular and Skeletal systems 23.2 Animal Diversity Gastrulation – blastula collapses inward

  11. 23.2 Animal Diversity

  12. Protostomes – blastopore first develops into a mouth Deuterostomes – blastopore first develops into anus 23.2 Animal Diversity Patterns of Development

  13. Acoelomates – body cavity is absent Flatworms Pseudocoelomate – mesoderm lines the fluid-filled coelom (body cavity) Coelomates – mesoderm lines the body cavity and surrounds and supports the gut 23.2 Animal Diversity Types of Body Cavities

More Related