5 parts

Heart- The heart is a cardiac muscle. It works without any help from you. It contracts, or tightens up, and relaxes to pump blood throughout your body.

Tendon- they connect muscles to bones. The Achilles Tendon connects your Gastrocnemius muscle to your heel.

Tongue- this is the only muscle in your body that is attached only at one end! It helps you swallow your food and talk.

Biceps- this muscle is the muscle you see when you flex your arm. When you flex, it contracts and when you, relax it relaxes.

Gluteus Maximus- this is the muscle that is in your behind. It attaches to the back of your leg to help you sit down.

Fun Fact!

When ever you move

any part of your

body, as a muscle

contracts, another relaxes.