2. Bones
•The skeletal system is made up of bones and
cartilage, which is the framework of our body.
•Babies have 300 bones
•Adults have 206 bones
•We have bones to help hold us up, so that we
are not one big blob on the floor
3.
4. What is a bone?
•A bone is made up of salts, water, and tissue
•Inside a bone, there is a thick jelly-like
substance that is called bone marrow.
•Bone marrow has a major job and that is to
make blood cells for our body.
5. Jobs of Bones:
1.Protect your body and give it strength
2.Protect your organs inside, such as lungs and
brain
3.Provide a support system for your muscles,
and allow you to move
4.Store minerals and make blood cells for your
body
6. Super Spine
•Your spine lets you twist and bend
•It holds your body upright
•Protects the spinal cord (a large bundle of nerves
that sends information from your brain to the rest of your
body)
•The spine is made of 26 bones in all!
•These bones are called vertebrae and each one
is shaped like a ring
7. Reliable Ribs
•Ribs “act like a cage of bones around your
chest”; they protect your heart, lungs, and liver
•Your ribs come in pairs
•Most people have 12 pairs of ribs, but believe
it or not, some people can be born with an extra
pair!
8. Skull or Cranium
•Protects your most important organ: your
brain
•Some bones protect the brain, while others
make up the structure of your face
•Cool fact: the smallest bone in our body is
found here; the stirrup bone behind your
eardrum is .1 to .13 inches!
9. Handy Hands and Flexible Feet
•The bones in your hand and feet are flexible
and very useful
•Each hand has 27 bones (carpals,
metacarpals, and phalanges)
•Each foot has 26 bones (tarsals, metatarsals,
and phalanges)
•We use our hands to grasp and write and our
feet to stand and walk
11. Helpful Hips & Long Legs
•The hip bone or pelvis helps us stand up
straight and move
•The femur bone in your thigh is the longest
bone in your body
•The knee bone is called the patella
•Shin bone = tibia, Calf bone = fibula
12.
13. Awesome Arms
•Each arm is attached to a shoulder blade or
scapula
•The arm is made up of 3 main bones: The
humerus (above your elbow) and the radius and
ulna (below your elbow)
•The two bones that form the shoulder are the
clavicle and scapula
17. Take Care of Your Bones!
•Wear a helmet to protect your brain
•Wear protective equipment when playing
sports
•Drink milk to help strengthen those bones
•Be active!
