3. • What is a Bone
• The Inside of a Bone
• Four Main Jobs of a Bone
• The Spine
• Ribs
• Hands and Feet
• Hips and Legs
• Arms

4. • The skeletal system is made up of the bones and
cartilage that forms the framework of your body.
• We have bones so that we are not a puddle of skin and
guts on the floor.
• Babies have 300 bones.
• Adults have 206 bones.

5. • A bone is made up of salts, water, and tissue.
• Inside a bone there is a jelly substance called
bone marrow.
• Bone marrow produces blood cells for the
body.

6. 1. To protect your body and give it shape.
2. To protect your internal organs.
3. To provide a scaffolding for your muscles,
allowing you to move.
4. To store minerals and make blood cells.

7. • The spine is the central support for the
body.
• The spine is made up of separate bones
called vertebrae.
• Between each vertebrae is cartilage which
keeps bones from rubbing against each
other.
• There are 26 vertebrae in the human
body.

8. • Ribs are the long curved bones which
form the rib cage.
• Rib cage is made up of 12 vertebrae, 24
ribs and a breastbone in three parts.
• Ribs surround the chest, enabling the
lungs to expand and thus facilitate
breathing by expanding the chest
cavity.
• They serve to protect the lungs, heart,
and other internal organs of the
thorax.

9. • The bones in your hands and
feet are VERY flexible.
• The foot has 26 bones. (tarsals,
metatarsals, and phalanges) .
• The hand has 27 bones.
(metacarpals, carpals, and
phalanges) .

10. • The hip bone helps us to
stand upright and move.
• The main bones of the
legs are the tibia, fibia,
and femur.
• The patella (kneecap) is
also important!

11. • The bones in the arm are very flexible.
• The three bones that make up the arm are the
ulna, radius, and humerus.
• The two bones that form the shoulder are the
clavicle and the scapula.