Rocket tries to wave with a stiff, straight arm. "It is hard!"
Raven asks, "What do you notice when you bend?"
Nova says, "Find where your arm folds."
A joint is where two bones meet.
Some joints do not move, like joints in your skull.
Many joints let you bend and move.
Strong bands hold the bones together at a joint.
Your elbows and knees have hinge joints.
A hinge joint works like a door hinge.
It bends one way, then straightens.
Your shoulders and hips have ball and socket joints.
A round end of a bone fits into a cup.
These joints move in almost every direction!
| Sentence | True or false? |
|---|---|
| Knees have hinge joints. | ? |
| Hips have ball and socket joints. | ? |
| An elbow can bend every direction. | ? |
| Some joints in your skull do not move. | ? |
Here are new sight words.
Look at each word. Say it. Spell it.
Even: E-V-E-N.
Such: S-U-C-H.
Great bending and swinging, scientist!
Tomorrow you will see how bone shapes fit their jobs.