The part of your body is the main cotrol center, giving orders to all areas of your body.

This is the hardest working muscle in the body?

You have two of these organs which inflate and deflate with every breath.

There are 206 of these in the human body.

Doing this strengthens and stretches the muscles to make them healthier.

You can get a basic idea of the brain's wrinkled appearance by looking at his vegetable.

The number of chambers, or special rooms, in the heart?

When resting, children do this apporximately 18-30 times per minute.

These 12 pairs fo chest bones protect the lungs and heart, both in front and in back of the chest.

These carry messages to muscles from the brain.

Your brain weighs about this amount when you are full grown?

Your heart rate can be measured by feeling this on your own?

This part of your respiratory system humidifies the air making it wet and warm before the air goes into your lungs.

This is a helmet-shaped bone that protects the brain.

These are very strong, rope-like tissues which anchor muscles to bone and make them stronger.

The vertebrae are a bony protection for this vital pathway.

This the approximate size of the heart muscle?

The name of the important gas that your body cells need in order to stay alive.

These bones protect the spinal cord.

The heart is the only place where this kind of muscle is found.

The main nerve pathway sends messages to and from the brain.

Approximate number of times a person's heart beats per minute!

The name of the important gas that your body cells need in order to stay alive.

This bone protect the heart.

The name for muscles that we can choose whether to move or not.