2. Respiratory System Made up of all organs that help you breathe All cells in your body require oxygen Main organs are your lungs. Respiration is breathing in and out Smoking and air pollution causes respiratory problems
3. Larynx Creates voice and sounds The larynx is often divided into three sections Sublarynx, larynx, and supralarynx
4. Trachea Is the entrance leading from the pharynx to the lungs Important part of the vertebrate respiratory system Life threatening if injured
5. Bronchus (Bronchi) One for each lung These, cut further into bronchioles Each major bronchus subdivides into smaller airway passages
6. Bronchioles The smallest vein of the bronchi Part of the airway passages in the lungs responsible for controlling air distribution and airflow resistance
7. Lungs Balloon like organs that fill up with air 15 to 25 times per minute Lungs are complex organs
8. Diaphragm Strong wall of muscle Separates the chest cavity from the abdominal cavity Thin, dome-shaped sheet of muscle that is below the ribs
9. Alveolus (Alveoli) Very small air sacs 600 million alveoli (air sacs) in your lungs CO2 follows the reverse course to reach the alveoli
