This document is a lesson about the human skeleton. It contains three main sections: (1) The skeleton has several jobs including supporting the body, allowing movement, and protecting organs. It is made of over 200 bones. (2) Bones are hard but can move where they join at joints. There are fixed joints like in the skull and movable joints that allow the body to move. Ligaments hold bones in place. (3) The lesson describes the three types of movable joints - hinge, pivot, and ball-and-socket - and where each type is located in the body.

1. Lesson
#1
You Can’t Move
Without
In a Skeleton! to
this lesson, we will begin
think and learn about our skeleton
and how important it is to us!
Created by Mr. Stephen Wentz
Council Rock School District

2. Your Skeleton has Several Jobs
• More than 200 bones make up your skeleton
• Skeleton helps support your body and stands you upright
• Bones are strong like steel beams in a building…they also
help us move.

3. Your Skeleton has Several Jobs
• Skeleton helps protect your body.
- skull is like a helmet, it protects your brain
- bones are like “armor” that help protect your organs
• With your group, name three organs, besides your brain,
that your skeleton protects…
- heart, liver, lungs, pancreas, etc.!
• Cool Fact! An adult has about 206 bones…but a baby has
as many as 270!
- some baby bones actually start out as two or three
bones, then they fuse together as they get older.

4. How Does a Skeleton Move?
• Bones are hard and don’t bend
• They can only move where they come together…
• Joint- the place where two or more bones come together.
• Fixed Joint- joints that cannot move, like those in the skull.

5. How Does a Skeleton Move?
• Moveable Joints- joints that move and allow you to move.
• Ligaments- stretchy bands that hold your bones in place so
you can move.

6. How Does a Skeleton Move?
• There are three different types of moveable joints…
• 1. Hinge Joints- allow your arms and legs to swing back
and forth
• 2. Pivot Joints- allow bones to rotate side to side.
-allows your wrist to brush dirt off your pants
-allows your neck to rotate side to side and say, “No”.
• 3. Ball-and-Socket Joints- allows you to swing your arms
and legs in almost any direction.
- ex: shoulders and hips

7. How does the human body
respond to physical activity?
• We saw…
• We felt…
• We heard…