2nd grade human body systems

Your muscles can function without your lungs.

The skeleton protects our 

Your Brain is inside what part of you body?

What is the function of the brain?

What is the function of the lungs?

The lungs are a part of the digestive system and the digestive system.

What is the name of the body system that includes nerves and the brain?

Your brain helps you learn things.

What is the function of the heart?

The lungs are the .... organs in the respiratory system.