Muscles help us to move our bodies and support our posture. They also help to regulate our temperature- they can be used to generate heat or even to raise hairs on our bodies in order to trap air. Muscles are also involved in moving substances such as food and blood around the body.

The muscles in our body can be separated into 3 main groups.

1. Skeletal muscles are most often what we think of when we think of "muscles". Skeletal muscles connect directly to the bones via tendons and allow us to move our bodies. These are stimulated by motor neurons and tire more rapidly than other types of muscle.

2. Smooth Muscles. These muscles are found along the lining of our blood vessels and intestines. These contract slowly and are responsible for maintaining the flow of fluids along tissue walls.

3. Cardiac Muscle. The final type of muscle we have is called cardiac muscle. This is only found in the heart and never tires!