1. Functions of the Skeletal System
It provides shape and support.
Enables you to move.
Protects your organs.
Produces blood cells.
Stores minerals and other materials until your body needs them.

2. - The Skeletal System
Joints of the Skeleton
A joint is a place in the body where two bones come together. Joints allow bones to move in different ways.
There are 4 different types of joints:
A. Ball and Socket
B. Hinge
C. Pivot
D. Gliding

3. Ball and Socket Joint

4. Hinge Joint

5. Pivot Joint

6. Gliding Joint

7. Movable Joints Activity
- The Skeletal System
Movable Joints Activity
Click the Active Art button to open a browser window and access Active Art about movable joints.

8. Bones—Strong and Living
- The Skeletal System
Bones are complex living structures that undergo growth and development.

9. Bone Structure
Compact Bone: hard and dense part of the bone, but not solid; contains small canals that carry blood vessels and nerves
Spongy Bone: located at the ends of the bones this type bone has small spaces throughout; lightweight and strong
Marrow: soft connective tissue in the middle of the bone
Red marrow produces most of the body’s blood cells.
Yellow marrow stores fat as an energy source.

10. - The Skeletal System
Asking Questions
Before you read, preview the red headings. In a graphic organizer like the one below, ask a what or how question for each heading. As you read, write answers to your questions.
Question
Answer
What does the skeleton do?
The skeleton provides shape and support, helps you to move, protects organs, produces blood cells, and stores minerals and other materials.
How do joints move?
Joints can move forward or backward, in a circle, in a rotating motion, and in a gliding motion.
How strong are bones?
Bones can absorb more force without breaking than granite or concrete.
What can I do to care for my bones?
Eat a well balanced diet and get
plenty of exercise.

11. End of Section: The Skeletal System