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Diffusion and the Molecules of Life

Diffusion and the Molecules of Life

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Diffusion and the Molecules of Life

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  1. Diffusion and the Molecules of Life Levels of Hierarchy and Organization in Living Systems and Multi-cellular organisms

  2. Molecules of Life

  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