1. Skeletal System

2. The Skeletal System
Your skeleton is made up of 206 bones. Bones have four Functions:
Protection
Support
Production of RBC and WBC
Movement

3. Support
The skeleton gives your body structure and support, like a frame of a house.
Without it, muscles would have nothing to attach to you and would be unable to move or even stand upright.

4. Protection The skeleton also protects other parts of your body.
For example:
the brain is protected by the skull;
the heart, lungs and liver are protected by the ribs;
the spinal cord is protected
by the backbone.

5. What is Bone Marrow?
Found in the center of certain long bones; Femur in legs and Humerus in arms
It’s a soft jelly-like substance.
where RBC’s and WBC’s are produced

6. Major Bones in the Human Body

7. What are Joints? Found where 2 or more bones meet.
Some joints allow movement Ex: arms, feet, legs
Other joints do NOT allow movement, like the skull
Joints can be injured by excessive twisting, called a sprain
Arthritis is an inflammation of the joints, which leads to painful motion.

8. Types of Joints:
Ball & Socket
Pivot
Fixed
Hinge
Gliding

9. Bones
Bones are made of connective tissues and minerals deposited by living cells.
Bones are organs made of living cells, blood vessels and nerves.
Bones help your body maintain homeostasis by storing fats and minerals and making blood cells. They usually have three layers.

10. Bone Layers

11. What are ligaments & tendons?
Ligaments are a type of connective tissue that attaches bones to bones.
Ligaments hold the skeleton
together.
Tendons are a type of connective tissue that attaches muscles to bones.
These allow us to move our
skeleton.

12. What is cartilage?
Most bones start out as flexible tissue called cartilage.
Newborn babies have very little true bones.
As you grow, cartilage is replaced by bones.

13. Bone Injury & Disease Osteoporosis: “bones that are porous (holey).”
Broken Bones: If a bone is put under too much stress, it will break.
A bone repairs itself when the osteocytes (bone cells)
make more calcium to fill in the broken space.
Osteoporosis: “bones that are porous (holey).”
As a person ages, less calcium
is deposited in the bones,
making them brittle.