Levels of Organization

1. Levels of Organization Learning Target: List and describe the structural levels of multicellular organisms. (knowledge) Use with “Human Body Organization”

2. Observe the diagram of the structural levels of a human. The levels of organization shown apply to all living multicellular organisms.

3. Chemical Level Inorganic molecules like H2O Organic molecules like DNA Chemicals combine to form ? Cells

4. Cellular Level Cells are the basic unit of life. Cells combine to form? Tissues

5. Tissue Level A group of similar cells that perform a common function. For example, these cells line the mouth forming layers of protection. Tissues combine to form? organs

6. Organ Level A group of tissues that work together to carry out a function. For example the stomach is made of a tissue that secrets digestive juices and a tissue that churns the food. Organs combine to form? Organ systems

7. Organ System A group of organs that work together to carry out a related function. Example: The liver, stomach and intestines carry out digestion. Organ systems form? Organisms

8. Organism An individual living thing. For example, a human is an organism.

9. Focus on Tissue We have already learned a great deal about the chemicals and cells of living things. Today and tomorrow we will observe cells that have combined to form tissue. There are 4 types of tissue that make up the human body. For each type of tissue you will learn its characteristics, location and function.

10. Epithelial Tissue Location Skin, glands, lining organs Characteristics Tightly packed cells Function Protection, absorption and secretion of substances Lining of respiratory tract

11. This is the epithelial tissue that makes up the surface of your skin.

12. Connective Tissue Location Under skin, surrounding organs, blood, bones Characteristics Cells are spaced further apart Function Binding, support, transport

13. This is the connective tissue that binds your skin to the organs beneath it such as muscle.

14. Muscle tissue Location Skeletal muscles, heart, walls of hollow organs Characteristics Elongated, contracts Function Movement

15. This is muscle tissue found in skeletal muscles such as your bicep.

16. Nervous Tissue Location Brain, spinal cord, nerves Characteristics Tendrils Function Sending nerve impulses

17. This is the nervous tissue that would be found in your brain.