The document discusses the major body systems and their functions. It describes the skeletal system which includes bones like the skull, spine, and ribs that provide structure and support. The nervous system includes the brain and spinal cord for sensation, control and communication. Other systems covered are the excretory system which cleans blood and removes waste; the circulatory system which involves the heart, blood vessels and blood flow; the respiratory system for breathing and gas exchange; the digestive system for processing food; and the liver which filters blood and aids digestion.

1. Body systems

2. All living organisms need 4 things in order to live

3. Energy (plants, meat, sunlight)

4. Energy (plants, meat, sunlight) Water

5. Energy (plants, meat, sunlight) Water Gases ( Oxygen, O 2 ; Carbon dioxide, CO 2 )

6. Energy (plants, meat, sunlight) Water Gases ( Oxygen, O 2 ; Carbon dioxide, CO 2 ) Waste removal

7. Body Systems

8. Body Systems Skeletal system - the bones

9. Body Systems Skeletal system - the bones Nervous system - the brain (wiring)

10. Body Systems Skeletal system - the bones Nervous system - the brain (wiring) Excretory system - cleans the blood

11. Body Systems Skeletal system - the bones Nervous system - the brain (wiring) Excretory system - cleans the blood Circulatory system - blood flow

12. Body Systems Skeletal system - the bones Nervous system - the brain (wiring) Excretory system - cleans the blood Circulatory system - blood flow Digestive system - food processing

13. Body Systems Skeletal system - the bones Nervous system - the brain (wiring) Excretory system - cleans the blood Circulatory system - blood flow Digestive system - food processing Liver - filters blood and helps digestion

14. Body Systems Skeletal system - the bones Nervous system - the brain (wiring) Excretory system - cleans the blood Circulatory system - blood flow Digestive system - food processing Liver - filters blood and helps digestion Respiratory system - breathing

15. Skeletal system The bones

16. Skeletal system Skull

17. Skeletal system Spine Spinal column Backbone Vertebrae

18. Skeletal system Rib cage ribs sternum spine

19. Nervous system Brain Spinal cord

20. Nervous system Brain Spinal cord

21. brain

22. Spine (close up showing spinal cord)

23. Excretory system cleans the blood, expels waste through the urine

24. Excretory system 2 kidneys 2 ureters (urine tubes) 1 bladder Cleans the blood, waste exits through urine

26. Circulatory system Heart Blood vessels arteries (take blood away from heart) veins (bring blood toward heart) capillaries (connect arteries to veins)

27. Circulatory system

28. heart

29. Breathing collects oxygen (O 2) releases carbon dioxide (CO 2) Respiratory system

30. 1 trachea 2 lungs Respiratory system

31. The circulatory and respiratory systems work together. The blood that returns to the heart through the veins is depleted of oxygen. First it is pumped to the lungs.

32. Small sacs with thin walls allow gases to be transferred from the blood

33. Oxygen is taken in from the air as carbon dioxide is released

34. Fresh (oxygenated) blood returns to the heart to be pumped back out to the body through the arteries.

35. Digestive system esophagus stomach small intestine large intestine (colon) rectum

36. Digestive system esophagus stomach small intestine large intestine (colon) rectum

37. esophagus stomach small intestine large intestine (colon) rectum Digestive system

38. liver Filters the blood and aids digestion

40. Skeletal system The bones Skull Spine Rib cage ribs; sternum