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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

Diffusion and the Molecules of Life

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

anatomy and physiology in the hierarchy of life
Anatomy and Physiology in the Hierarchy of Life

Molecules

Cells

Tissues

Organs/Structures

Organ Systems

Organisms

Environment

levels of organization
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)
the importance of diffusion
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

body systems and diffusion
Body Systems and Diffusion
  • Understand path through body of:
  • Food/Nutrients (glucose)
  • Oxygen
  • Carbon Dioxide
  • Nitrogen
homeostasis
Homeostasis

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

  • Within cells
  • Within body
feedback mechanisms
Feedback Mechanisms
  • Negative Feedback Examples
    • home heating system
    • Glucose regulation in blood
  • Positive Feedback Examples
    • Fire-Starting
    • Blood clotting
web links
Web Links
  • Cellular basis of physiology
  • Diffusion/Osmosis animation
next time

Next Time:

Overview of Body Systems

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