Skeletal System

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Compact 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