RESPIRATORY SYSTEM
PATHWAY – GAS EXCHANGE
Nose/mouth 
Larynx (vocal chords/
adams’s apple) 
trachea 
bronchi 
bronchiole tubes 
alveoli (gas exchanges
occurs)
GAS EXCHANGE
Alveoli – surrounded by
capillaries; diffusion of O2
& CO2
ROLE OF DIAPHRAGM
• Contracts  chest cavity expands & inhale
• Relaxes  chest cavity shrinks & exhale