1. Organ Systems and Homeostasis PH 508-517

3. Previously in life science… You learned that cells are the basic building blocks of living things. Now, you will learn how those cells are organized in levels to create a whole organism.

4. Do you remember the function of the nucleus?

5. A. the nucleus directs the cell’s activities!

6. B. Do you remember the function of the cell membrane?

7. B. the membrane forms outside boundary of the cell!

8. 1. Identify the levels of organization in the body. 1.Cells 2.Tissues 3.Organs 4.Organ Systems 5.Whole Organism Complex Simple

11. 2. What is a cell? The basic unit of structure and function in living things

13. 3. What is a tissue?

14. The “thing” you use to blow your nose!!!

15. A group of cells that perform the same function

16. 4. What are the 4 basic tissue types? 1.Muscle tissue – can shorten to make you move ex: muscle & heart

17. 2. Nerve tissue – carry messages throughout body ex: brain & spinal cord

18. 3.Connective tissue – supports and connects the body ex: blood, fat, bones

19. 4.Epithelial tissue – covers surfaces of body ex: skin & internal organs

20. What is the job of muscle tissue? To make parts of the body move

21. 5. What are organs? A group of tissues that perform a function. ex: stomach, heart, brain, lungs

26. 6. What are organ systems? A group of organs that work together to perform a major function

27. 7. What are the major organ systems of the body? Movement: Integumentary Skeletal Muscular Life Processes: Circulatory Respiratory Digestive Excretory Immune Reproductive Control: Nervous Endocrine

39. 8. Why do organ systems work/function? Because of the contributions of the individual organs, tissues, and cells!

40. 9. What happens if part of an organ system fails? Failure of any part can affect the entire system, potentially causing organ system failure Example: heart attack

42. 10. What is homeostasis? The process by which an organism's internal environment is kept stable despite changes in the external environment. Ex: body temperature!

43. What did you learn today? You learned how cells are organized in levels to create a whole organism: cells, tissue, organ, organ system.

44. Tissue Observations 1.Fold paper into fourths 2.Create 2 circles 3.Label top half “blood” 4.Label bottom half “nerve” Tissue Observations blood nerve _______ _______ _______

45. Blood

46. Nerve Tissue