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7th Grade Ch. 1 Sec. 2 Skeletal System


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7th Grade Ch. 1 Sec. 2 Skeletal System

  1. 1. Ch. 1 Sec. 2 The Skeletal System
  2. 2. (cranium) Skeleton model
  3. 3. Functions of Skeletal System 1. Provides shape & support 2. Enables movement 3. Protects internal organs 4. Produces blood cells 5. Stores certain materials until body needs them
  4. 4. 1. Provides shape & support vertebrae = 26 bones that make up backbone (vertebra- singular) Newborn- 275 bones Adult- 206 bones
  5. 5. 2. Enables you to move Muscles pull on bones
  6. 6. 3. Protects internal organs Skull protects brain Ribs protect heart & lungs
  7. 7. 4. Produces blood cells made by bone marrow
  8. 8. 5. Stores certain materials until your body needs them calcium & phosphorus
  9. 9. Bones- strong & living Hard b/c made of Ca & P Contain cells & tissues Form new bone tissue as you grow
  10. 10. Structure of bones outer membrane = covers bone, except @ ends- cartilage (connective tissue-more flexible than bone) compact bone = hard & dense spongy bone = lightweight but strong
  11. 11. Structure of bones marrow= soft, connective tissue found in spaces in bone 2 types: red bone marrow- produces most blood cells yellow bone marrow- energy reserve
  12. 12. Bone Structure
  13. 13. infant- skeleton mostly cartilage
  14. 14. How Bones Change As We Grow [04:43]
  15. 15. healthy bones well balanced diet exercise wear safety equipment Ca & P
  16. 16. osteoporosis condition where body’s bones become weak & break easily due to mineral loss more common in women than men
  17. 17. ACTIVITY "HOLLOW STRENGTH " 1) Students will roll up a sheet of paper (8 1/2 x 11) about 1 in wide into a cylinder. They will make 3 of these (paper bones). 2) Students will stand the bones up on their ends, placing a paper plate on top of the bones. 3) Teacher will ask students to tell what is happening - the hollow rolls will support the plate. 4) Students will begin to add weights (wooden blocks) to the plate. 5) Students will count how many blocks the plate can hold before it collapses the bones. 6) Students will roll 3 more sheets of paper as tightly as they can so that there is no hollow section. 7) Students will stand these "bones" up as before placing the same plate on top of them. 8) Students will place weights on top of the plate until they collapse. 9) Students will deduce what happened. Teacher will explain that hollow bones were able to support more weight. Teacher will also explain that having a hollow center gave the bones a better design and made them stronger. Teacher will continue explaining that the large bones in our body are also hollow, which makes them strong so they can support more weight, but light, so it takes less energy to move them.
  18. 18. place where 2 bones come together joint
  19. 19. 2 kinds of joints: immovable joint- little or no movement eg: skull bones 2. movable joints
  20. 20. ball & socket joint greatest range of motion shoulder & hips
  21. 21. hinge joint forward or backward motion knee & elbow
  22. 22. pivot joint bone rotates around another neck
  23. 23. gliding joint 1 bone slides over another wrist, ankle, vertebra
  24. 24. Video-Bone Joints
  25. 25. Skills Activity-pg. 15 Perform these activities. Determine which type of movable joint or joints is involved in performing each activity. Give a reason to support your classifications. Move your arm in a circle. Push open a door. Lift a book from a desk. Kneel down. Wave your hand. Twist your head from side to side.
  26. 26. gliding joint hinge joint pivot joint immovable joint ball & socket joint What kind of joint is it?
  27. 27. ligament tissue that holds bones in movable joints together Bone
  28. 28. _________________ _________________ _________________ _________________ _________________ _________________ _________________ Label your body’s framework with the scientific name for each bone. _________________ _________________