Respiratory system

4. The process where the diaphragm contracts and causes air to be drawn into the lungs
7. The air sacs where gaseous exchange occurs
8. Flap to stop food travelling down the trachea
9. A part of the brain that assists with the nervous control of breathing
13. The volume of air that remains in the lungs after forced maximum expiration

1. is a space inside your thorax (chest) that contains your heart, lungs and other organs and tissues
2. Detects changes in PH and CO2
3. Small increases in breathing at the onset of exercise
5. A structure surrounded by cartilage and leads to the bronchus
6. The vessels that surround the alveoli
10. The volume of air inspired or expired per breath
11. A common condition where airways can become restricted.
12. The process used during gasous exchange