1. 1.2 Levels of Organization
Sponge: Set up Cornell Notes on pg. 9 Topic: 1.2 Levels of Organization Essential Question: Explain how organs and organ systems are related.
Levels of Organization
2.1 Atoms, Ions, and Molecules
Explain how organs and organ systems are related.

2. Levels of Organization

3. Levels of Organization
Subatomic Particles – electrons, protons, neutrons
Atom – Basic unit of matter
Molecule – Atoms bound together
Macromolecule – Molecules bound together

4. Organelles: Carry out specific activities in the cell
Exs:
Mitochondria- powerhouse of cell
Nucleus- contains genetic info (DNA)

5. Cells: Basic unit of life
Cells: Basic unit of life. Organisms are made up of specialized cells that each have a particular structure that enables it to perform a specific task
Exs:
Red blood cell- delivers oxygen to all tissues
Nerve cell- provides a pathway for electrochemical
nerve impulses

6. Tissues: are groups of similar cells working together to perform a specialized function
Exs:
Epithelial tissue
Muscle tissue
tissue
cell

7. Organs: are different types of tissues working together to perform a function
Exs:
Stomach
Liver
Lungs

8. Organ systems: two or more organs working together to perform a function
Perform the most complex activities in the body
Exs:
Respiratory system
Circulatory system
Digestive system

9. There are 11 major organ systems in the human body (p. 856 in bio book)

10. Organism: The organ systems make up the entire organism.
For the organism to stay alive, all of the systems must interact and work together.

12. Levels of Organization (2m29s)

13. Levels of Organization Flow Map Example
Organ System
Cells
Tissue
Organ
Organism
Lungs
Site where gases are exchanged
Human
Epithelial lung Tissue
Epithelial lung cell
Respiratory System
Brings O² for cells
Expels CO² and water vapor
Nose, sinuses, pharynx, larynx, trachea, lungs

14. Levels of Organization Flow map
Start by picking your organ system, organ, etc…
You MAY NOT use the respiratory system

15. Levels of Organization Flow Map (p. 8)
Cells/Organelles p
Systems/Organs p BIO book *856
Cells
Tissues
Organ
Organ System
Organism
Type of Cell
Type of Tissue
Name of specific organ
Function of your organ
Organism (human)
Name of organ system
Function of your organ system
Include list of organs involved
Picture
Picture
Picture
Picture
Picture

16. Characteristics of Life
Movement – change in position; motion
Responsiveness – reaction to a change
Growth – increase in body size; no change in shape
Reproduction – production of new organisms and new cells
Respiration – obtaining oxygen; removing carbon dioxide; releasing energy from foods

17. Characteristics of Life
Digestion – breakdown of food substances into simpler forms
Absorption – passage of substances through membranes and into body fluids
Circulation – movement of substances in body fluids
Assimilation – changing of absorbed substances into chemically different forms
Excretion – removal of wastes produced by metabolic reactions

18. Requirements of Organisms
Life depends on five environmental factors
water
food
oxygen
heat
pressure

19. Requirements of Organisms
Water
- most abundant substance in body
- required for metabolic processes
- required for transport of substances
- regulates body temperature
Food
- provides necessary nutrients
- supplies energy
- supplies raw materials

20. Requirements of Organisms
Oxygen (Gas)
- one-fifth of air
- used to release energy from nutrients
Heat
- form of energy
- partly controls rate of metabolic reactions
Pressure
- application of force on an object
- atmospheric pressure – important for breathing
- hydrostatic pressure – keeps blood flowing

21. Clinical Application: Medical Imaging
Noninvasive procedures
Provide images of soft internal structures
Ultrasonography (aka Ultrasound)
Use of high-frequency sound waves
Relatively quick and inexpensive
Magnetic Resonance Imaging (MRI)
Requires injection of dye
Produces computerized images from different angles