This is about the skeletal system.

1. THE SKELETAL SYSTEM
By Lily Blaier and Mackenzie Camera

2. INTRODUCTION
Ever wonder about the reason of having a skeleton?
Neither have we. Without a skeleton, we’d be a monstrous blob of
flesh and blood. The skeleton basically provides everything you need
to move everyday. It protects your vital organs and literally keeps you
in shape. Let’s learn about something that is clearly underrated.

3. MAKE-UP
 Cartilage and Calcified Bone
1. Helps with movement
2. Works with circulatory system
 Marrow
1. Helps produce blood.
2. Creates red and white blood cells

4. BONE PURPOSES
 Protection
1. Protects the organs
2. Spinal cord is protected by vertebrae
3. Brain is protected by skull
 Storage
1. Bones store minerals for nerves and
muscles.
2. Long bones store fat.
 Movement
1. Skeletal muscles pull on your bones when
you move
 Blood Cell Formation
1. Bones are filled with marrow. (Which
you’ll learn about on the next slide.)

5. MARROW
 There are two types of marrow.
 Marrow creates blood or stores fat depending on its type.
 A child’s marrow changes from red to yellow over time. You can
see a diagram of a child’s bone marrow pictured below.

6. JOINTS
Gliding
1. Gives some flexibility.
Ball-and-Socket
1. Allows it to move freely.
Hinge
1. Flexes and extends.

7. COMPACT BONE
 Doesn’t have many spaces
 Tiny canals where there are spaces
 Blood vessels in the canals
 The vessels are how bones help the circulatory system.

8. SPONGY BONE
 Many open spaces
 Offers most support
 Has most strength

9. GENETIC DISORDERS
1. Are inherited or developed over time.
 Diseases
1. Arthritis – stiffening and weakening of the bones and
joints.
2. Osteoporosis – makes bones less dense.
3. Acromegaly – excessive hormone growth in bones.
4. Collagen – bones become brittle and easily break.
5. Scoliosis – a curvature of the spine

10. INJURIES
1. Bones can become weak from poor nutrition and age.
 Dislocated joints
1. Bones are out of place.
 Broken bones
1. When bones are broken.
 Sprains
1. When a ligament is torn.

11. SUMMARY
 There are three types of joints: hinge joints,
gliding joints, and ball-and-socket joints
 There are two types of bone marrow: red
and yellow.
 Spongy and compact are the different types
of bone.
 The skeleton has many purposes