4th grade Science

The function of the skeleton is to provide

• Support

• Protection

• Movement

• Shape

• Bones of many mammals are similar in number and shape, but differ in what

• Shape

• Size

• Color

• Number

• Some animals have skeletons on the outside of their bodies. This kind of skeleton is called an

• • exoskeleton

• Outside skeleton

• Animal skeleton

• Inoxskeleton

longest bone in the body

• Femur

• Stirrup

• ball-and-socket joint,

• hinge joints,

shortest bone in the body

• Femur

• Stirrup

• ball-and-socket joint,

• hinge joints,

are essential for performing everyday task easily. It has two joints.

• • Opposable thumbs

• • Articulated hands and opposable thumbs

• ball-and-socket joint,

• hinge joints,

• are essential for performing intricate tasks

• • Opposable thumbs

• • Articulated hands and opposable thumbs

• ball-and-socket joint,

• hinge joints,

• The simplest kind of joint. They can flex (close) and extend (open) like a door.

• • Hinge joint:

• • Ball-and-socket joint:

• • Gliding joints:

• • Fixed joints:

• The most versatile joint. They can move in three ways: up and down, back and forth, rotation.

• • Hinge joint:

• • Ball-and-socket joint:

• • Gliding joints:

• • Fixed joints:

• They allow movement in two directions: back and forth, up and down.

• • Hinge joint:

• • Ball-and-socket joint:

• • Gliding joints:

• • Fixed joints: