1. Cellular Organization Sec. 7-4

2. From Simple to More Complex Many multicellular organisms have structures called organs that have a specific function and work with other organs. Working together, these organs carry out the life processes of the entire organism. Section 7- 4 Interest Grabber Go to Section:

3. 1. Some activities cannot be performed by only one person, but need a team of people. What type of activity requires a team of people to work together in order to complete a task? 2. What do you think are some characteristics of a successful team? 3. How is a multicellular organism similar to a successful team? Section 7- 4 Interest Grabber continued Go to Section:

4. 7–4The Diversity of Cellular Life – ALL cells use the same basic chemistry – Cells are specialized, as individuals or as parts of larger organisms – Grow, respond, reproduce Section 7- 4 Section Outline Go to Section:

5. A. Unicellular Organisms: Single celled organism - Dominate life on Earth - Prokaryotes -Bacteria – adaptable -Eukaryotes -Algae, Yeast (unicellular fungi), and Protists

6. B. Multicellular Organisms: Made up of many cells that work together - Interdependent (team) - Cell specialization

7. C.Levels of Organization 1.Cells: Basic living units of ALL organisms 2.Tissues: Group of similar cells that perform a particular function -4 main types: muscle, epithelial (cover or line body), nervous, and connective (bone, blood, cartilage, and lymph)

8. 3.Organs: Many groups of tissues working together 4.Organ Systems: Group of organs that work together to perform a specific function - 11 major organ systems: muscular, skeletal, circulatory, nervous, integumentary, respiratory, digestive, excretory, endocrine, reproductive, and immune

9. Muscle cellSmooth muscle tissueStomachDigestive system Section 7- 4 Levels of Organization Go to Section: