Respiratory System Take a big whiff!
Why do we need to breathe? All cells need oxygen Cellular Respiration: Process of breaking down glucose into ATP
Primary Functions Supply blood with O2 Remove CO2
Pathway of Air 1. Air enters through nose or mouth 2. Passes through pharynx
Pathway of Air (cont.) 3. Larynx (voice box) 4. Trachea (wind pipe) 5. Lungs
Pathway of Air (cont.) CO2 & O2 exchanged in tiny sacs called alveoli
Pathway of Air (cont.) Alveoli help to warm & moisten the air
Lung Anatomy Trachea has 2 branches Divided further into bronchioles
Lung Anatomy (cont.) Alveoli are at end of bronchioles O2 enters blood CO2 enters alveoli
Inhalation 1. Lungs expand & move down 2. Diaphragm contracts & moves down
Exhalation 1. Lungs reduce in size 2. Diaphragm relaxes & moves up