1. Bones are organs. 5 Major Functions LIVING Supporting Framework Protects Organs Allows Movement Stores Minerals Pg. 386

2. Stores Minerals Calcium & Phosphorus Strength & Hardness Protein Flexibility Can bones be strong, hard, and flexible? Ex: Ribs, arches in feet…

3. Bones are organs. 5 Major Functions LIVING Supporting Framework Protects Organs Allows Movement Stores Minerals Produces Blood Cells Pg. 386

4. Produces Blood Cells Spongy Bone: Bone tissue that contains small spaces. Located at the ends of LONG bones. Functions as a shock absorber. Red Bone Marrow: Fills spaces of Spongy Bone. RBC & WBC are produced here. Millions made every second. Humerus Upper Arm Bone RBM Fills spaces

5. Bone Shaft god Bone end Yellow Marrow Compact Bone Periosteum mmmmmmm Marrow cavity kkkkkkk ssssss Red Marrow In Spongy Bone o Structure of Bone g Periosteum  Strong, protective membrane  Contains blood vessels  Form bone tissue for growth & repair.  Muscle attaches here Compact Bone  Hard & Dense, few spaces  Gives strength to shaft  Thickest in shaft  Thinnest at ends  Protects spongy bone

6. Bone Shaft god Bone end Yellow Marrow Compact Bone Periosteum mmmmmmm Marrow cavity kkkkkkk ssssss Red Marrow In Spongy Bone o Structure of Bone g Yellow Bone Marrow  In center of long bones  Inside Compact Bone  Runs length of shaft  Mostly FAT cells * ONLY produces BC’s in Emergencies

7. Now Label Your Diagram AB CD E F G A = E = B = F = C = G = D = RBM YBM Compact Bone Periosteum Spongy Bone Bone Shaft

8. How Bones Grow& Change Babies Bones (300 +)  Contain cartilage: Tough, strong tissue Not as hard as bone but more flexible.  Can bend a bit w/o breaking  Infancy – childhood: ossification occurs.  bone is formed, renewed, & repaired.  Cartilage is replaced w/bone.

9. How Bones Grow& Change Formation & Loss of bone continue for entire life! But… at different rates. Childhood Early/mid adultElder aged Formation Loss

10. How Bones Grow& Change Activity strengthens bones Increasing mineral deposits Your whole body benefits! Vitamins A, C, and D help your body absorb minerals.