1. Organization of Life

2. Levels of Organization The different branches of biology can be classified based on different levels of complexity Each “level” is made up of smaller component, and usually contributes to a larger system.

3. Levels- smallest to biggest 1.Molecules- groups of atoms; the smallest unit of most chemical compounds 2.Cells- smallest functional unit of life. Basic units of structure and function. 3.Tissues- composed of specialized cells which perform a specific function – Ex. Blood, muscle, nerve

4. Levels of Structural Organization Figure 1.1, step 1 Molecules Atoms Chemical level Atoms combine to form molecules

5. Levels of Structural Organization Figure 1.1, step 2 Smooth muscle cell Molecules Atoms Cellular level Cells are made up of molecules Chemical level Atoms combine to form molecules

6. Levels of Structural Organization Figure 1.1, step 3 Smooth muscle cell Molecules Atoms Smooth muscle tissue Cellular level Cells are made up of molecules Tissue level Tissues consist of similar types of cells Chemical level Atoms combine to form molecules

7. Levels- smallest to biggest 4.Organs- groups of specialized tissues that perform a specific function – Ex. Heart, brain, liver, skin 5.Organ Systems- consist of different organs that work together to perform a specific function – Ex. Digestive, nervous 6.Organism- any single living thing

8. Levels of Structural Organization Figure 1.1, step 4 Smooth muscle cell Molecules Atoms Smooth muscle tissue Epithelial tissue Smooth muscle tissue Connective tissue Blood vessel (organ) Cellular level Cells are made up of molecules Tissue level Tissues consist of similar types of cells Organ level Organs are made up of different types of tissues Chemical level Atoms combine to form molecules

9. Levels of Structural Organization Figure 1.1, step 5 Smooth muscle cell Molecules Atoms Smooth muscle tissue Epithelial tissue Smooth muscle tissue Connective tissue Blood vessel (organ) Cardio- vascular system Cellular level Cells are made up of molecules Tissue level Tissues consist of similar types of cells Organ level Organs are made up of different types of tissues Organ system level Organ systems consist of different organs that work together closely Chemical level Atoms combine to form molecules

10. Levels of Structural Organization Figure 1.1, step 6 Smooth muscle cell Molecules Atoms Smooth muscle tissue Epithelial tissue Smooth muscle tissue Connective tissue Blood vessel (organ) Cardio- vascular system Cellular level Cells are made up of molecules Tissue level Tissues consist of similar types of cells Organ level Organs are made up of different types of tissues Organ system level Organ systems consist of different organs that work together closely Organismal level Human organisms are made up of many organ systems Chemical level Atoms combine to form molecules

11. Getting Bigger… Population: Organisms of a species interact to form a population – Species: group of similar organisms that are capable of interbreeding to produce fertile offspring. Community: Populations of different species that live together in an area create a community. Ecosystem: The community and it’s non-living environment make up an ecosystem.