Human+Respiratory+System

The body is asymmetrical -left lungs have one less lobe to make space for the heart

Muscles are never all relaxed

The trachea muscle has a c-shaped cartilage to ensure it stays as a tube Not the whole trachea is made of cartilage so that it makes space for peristalsis

The lungs cannot inhale and exhale on their own-they don't have muscles for this. Instead, they rely on the contraction and relaxation of the intercostal muscles and the diaphragm

Volume is inversely proportionate to pressure

Control of breathing -controlled by the amount of carbon dioxide -low pH will trick your body into making you breathe faster