Paranasal sinuses: Air spaces within the skull.
• Pharynx: The throat.
• Pleural membrane: Covering the lung and lining the chest
cavity, this membrane has 2 thin layers.
46
• Pulmonary vessels: Pulmonary arteries carry deoxygenated
blood from the heart and lungs; pulmonary veins carry
oxygenated blood back to the heart.
• Respiratory center: Area of the brain that controls breathing.
• Ribs: Bones attached to the spine and central portion of the
breastbone, which support the chest wall and protect the
heart, lungs, and other organs in the chest.
• Trachea: Tube through which air passes from the nose to the
lungs (also known as the windpipe).