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Diffusion2

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ppt - Diffusion2

ppt - Diffusion2

Published in: Health & Medicine, Technology

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Transcript

  • 1. Diffusion and the Molecules of Life Levels of Hierarchy and Organization in Living Systems and Multi-cellular organisms
  • 2. Molecules of Life Main Functions Component C-chain
  • 3. Anatomy and Physiology in the Hierarchy of Life
    • Molecules
      • Cells
        • Tissues
          • Organs/Structures
          • Organ Systems
            • Organisms
            • Environment
  • 4. Levels of Organization within Human Body
  • 5. Levels of Organization
    • Chemical Level (Organic Chemistry and Biochemistry
    • Cellular Level (Intro. Or Cell Biology): organelles, genes, mitosis, meiosis
    • Tissue Level (Histology): groups of cells with common function—classes of tissues, epithelia (covering), connective tissues (support, protection)
    • Organ Level (Anatomy): how tissues combine to form structures in body—lungs, bones, blood vessels, etc.
    • Organ System level (Physiology) How organs and structures work together to accomplish specific functions: e.g., circulatory system, nervous system, skeletal system, etc.
    • Organism: Entire body working together (Ecology or physiology in environment)
  • 6. The importance of Diffusion
    • Diffusion versus Osmosis (diffusion across a membrane)
    • Diffusion fast and effective across microscopic distance
    • Virtually all living processes involve diffusion and/or osmosis
    • Cell membranes control diffusion and allow for life chemical reactions to take place
    • Diffusion lets tissues do job and permits organ systems to function
    • Examples:
      • Oxygen in circulatory
      • system
      • Food in digestive
      • system
      • Calcium in muscular
      • function
      • Nerve impulses
    Cell membranes and Diffusion
  • 7. Body Systems and Diffusion
    • Understand path through body of:
    • Food/Nutrients (glucose)
    • Oxygen
    • Carbon Dioxide
    • Nitrogen
  • 8. Homeostasis “…the ability to maintain relatively constant internal conditions even though the outside world changes continuously…”
    • Within cells
    • Within body
  • 9. Feedback Mechanisms
    • Negative Feedback Examples
      • home heating system
      • Glucose regulation in blood
    • Positive Feedback Examples
      • Fire-Starting
      • Blood clotting
  • 10. Web Links
    • Cellular basis of physiology
    • Diffusion/Osmosis animation
  • 11. Next Time: Overview of Body Systems