Alveoli: Where oxygen moves into the blood.

Bronchi: Two tubes that move air into each lung.

Bronchioles: Small tubes throughout the lungs.

Cartilage rings: Hold open the trachea to let air move through easily.

Diaphragm: Muscle under the lungs that moves up and down.

Intercostal muscles: Muscles between the ribs that help with breathing.

Larynx: Structure in the neck that holds the vocal cords.

Ribs: Made of bone to protect the lungs from impact.

Trachea: The tube that brings air into the bronchi.