Skeletal system science 6
- 2. BONES MUSCLES It is composed of many muscles and bones
- 3. THE MUSCULOSKELETAL SYSTEM • It supports the body and protects the organs. • It lets you move your body parts and go from one place to another.
- 4. THE HUMAN SKELETON • Humans have got an internal skeleton. It is made of 206 different bones. • Bones are rigid and hard.
- 5. Functions of the skeleton: • 1---It supports the body and helps to keep its shape.
- 6. • 2---It protects the body’s soft organs, like the brain, the lungs and the heart.
- 7. • Bones can move because they are connected to muscles. • 3---So movement is another function of the skeleton.
- 8. BONES • Bones can be different shapes and sizes. • There are long bones, short bones, flat bones and cylindrical bones.
- 9. • The FEMUR is the longest bone in the body.
- 10. • The PELVIS is the biggest bone in the body.
- 11. • the EAR BONES are the smallest bones in the body.
- 12. We can put the human bones into three groups: 1--- bones in the head 2--- bones in the extremities ( arms and legs) 3--- bones of the torso HEAD EXTREMITIES TRUNK
- 13. SKULL / CRANIUM
- 14. The bones in the torso are: The spine (or spinal Column, or vertebral Column) The sternum The ribs
- 15. THE SPINE IS FORMED BY 33 VERTEBRAE
- 18. Joints • There are 3 types: 1. Fixed: they cannot move 2. Semi-moveable: they can move a little (vertebrae) 3. Moveable: they can move a lot (elbows, knees, shoulders)
- 19. FIXED JOINT
- 21. MOVEABLE JOINT
- 23. LIGAMENTS • Ligaments attach bone to bone
- 24. Muscles are soft and elastic
- 25. There are more than 600 muscles all over the human body. Muscles are made of muscle cells. These cells can contract and relax. Muscles contract and relax to make your body parts move.
- 26. When a muscle contracts it becomes shorter. When a muscle relaxes it becomes longer. CONTRACT ----------------- SHORTER RELAX--------------------------- LONGER
- 27. QUADRICEPS
- 30. • SKELETAL MUSCLES ARE ATTACHED TO BONES BY TENDONS
- 31. which includes The bones of the head The bones of the trunk The bones of the extremities The muscles of the trunk The muscles of the extremities which include The muscles of the face includes THE MUSCULOSKELETAL SYSTEM HUMAN SKELETON MUSCLES