Ch-8-Body Movements.pptx Body Movements

body movements

1. Ch-8-Body Movements Introduction Human body movements Joints Ball & Socket joint Hinge joint Pivotal joint Fixed joint Skeletal System Bones Cartilage Muscles Movement in Earthworm Snail Cockroach Fish Birds Snake

2. Introduction Every action requires movement

3. What is a movement or locomotion? Movement- changing posture Locomotion- Movement causing change of place of the entire organism

4. Rotate bend

5. Two parts of our body seemed to be joined together- called JOINTS Touch your head, face fingers, ear etc . Hard part is called BONE HOW DO WE BEND BONES THEN?

6. Joint 1. Ball and socket joint Ball like surface of one rounded bone is joined into cup like depression of another bone Socket- is a fluid filled cavity allows movements Allows movement in all directions Examples- Hip or pelvis and shoulder

7. 2. Pivotal joint A cylinder shaped bone rotates inside another bone that forms a ring around it A cylindrical bone rotates in a ring Allows only rotary movement

8. 3. Hinge joint Bones can move only along one axis to bend/ extend or allows movement in one plane Allows back and forth movement femur tibia Knee cap

9. Examples of hinge joint Elbow knee Ankle

10. 4.Fibrous/Fixed joint Do not allow any movement Found in cranium, upper jaw

11. Cartilaginous joint Limited movements are allowed Bones are joined with cartilage Found in vertebral column

12. Human Skeletal System It gives a framework to our body Framework is called skeleton X-ray image

13. Rib cage Joins the chest and the back bone thus forming a rib cage Some of the internal parts of the body lie protected inside it Skull is made up of many bones joined together Encloses and protects the brain

14. Backbone Made of many small bones Rib cage is joined to these bones Helps to bend back and forth Pelvic bone Below the stomach Part we sit on

15. Touch your ears Cartilage - is not as hard as bones and can be bent Muscles work in pair. One pair contracts to pull the bone while other relaxes.to pull the bone in opposite direction, the relaxed muscle contracts to pull the bone towards its original position. Muscle can only pull it can not push

16. Gait of animals 1. Earthworm Reddish brown terrestrial invertebrate – Vertebral column absent Also known as “Farmers friend” Invertebrate Do not have vertebrate column