Studied by 30 peopleCompact bone
Hard,dense,solid.Found between periosteum and spongy bone
Spongy bone
Hard,porous;lightweight but strong
Cartilage
Found on the ends of bones,strong,flexible,cushions bones,prevents friction
Yellow marrow
Stores fat for energy
Red marrow
Produces blood
Periosteum
Thin tough membrane,covers bones
Main function of the skeletal system
Provides shape and structure(protects and holds organs in place)
The skeletal system also
Enables movement,produces blood,stores minerals and other materials
Bone growth happens during
Excercise/after injury
Bones can withstand as much force as _______ without breaking
Granite
Center of the skeleton
Vertebral column
New borns have 300 bones adults have ______ bones
260
As you grow your bones grow and _________
Fuse together
_____ of an adult’s weight is the skeleton
20%
Joints
A place where to bones meet,2 types:immovable and movable
Ligaments
Strong,flexible tissue;holds together movable joints,less flexible than cartilage(connects bone to bone)
Tendons
Same tissue as ligaments,connects muscle to bone
Pivot joint
Rotates one bone around another
Ex:neck
Hinge joint
Forward/backward movement
Ex:elbow,knee
Ball and socket
Greatest range of movement
Ex:hip and shoulder
Gliding joint
Allows bones to slide over one another
Ex:wrist and ankle
Saddle joint
One bone is concave,the other convex,stability,more movement than hinge
Ex:thumb
As a baby skeleton is mostly_____
Cartilage
Cartilage replaced with ______ as you grow
Bone
Bones are made of
Calcium phosphate
Bones store
Calcium and phosphorus
Note 
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