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Diffusion and the Molecules of Life PowerPoint PPT Presentation


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Diffusion and the Molecules of Life. Levels of Hierarchy and Organization in Living Systems and Multi-cellular organisms. Molecules of Life. Anatomy and Physiology in the Hierarchy of Life. Molecules Cells Tissues Organs/Structures Organ Systems Organisms

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Diffusion and the Molecules of Life

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Diffusion and the molecules of life l.jpg

Diffusion and the Molecules of Life

Levels of Hierarchy and Organization in Living Systems and Multi-cellular organisms


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Molecules of Life


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Anatomy and Physiology in the Hierarchy of Life

Molecules

Cells

Tissues

Organs/Structures

Organ Systems

Organisms

Environment


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Levels of Organization within Human Body


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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)


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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


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Body Systems and Diffusion

  • Understand path through body of:

  • Food/Nutrients (glucose)

  • Oxygen

  • Carbon Dioxide

  • Nitrogen


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Homeostasis

“…the ability to maintain relatively constant internal conditions even though the outside world changes continuously…”

  • Within cells

  • Within body


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Feedback Mechanisms

  • Negative Feedback Examples

    • home heating system

    • Glucose regulation in blood

  • Positive Feedback Examples

    • Fire-Starting

    • Blood clotting


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Web Links

  • Cellular basis of physiology

  • Diffusion/Osmosis animation


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Next Time:

Overview of Body Systems


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