RESPIRATORY SYSTEM

3. is the physical act of breathing
4. hollow spaces in the skull that connect to the nasal cavity.
5. is a flat, dome-shaped muscle below the lungs and separates the thoracic cavity from the abdominal cavity.
7. extends from the trachea to the alveoli in the lungs.
9. is the passageway for air into the lungs and It extends from the cricoid cartilage to the carina, which is where it splits into two passages.
11. tiny hairs
13. is the process during which the cells use oxygen and other nutrients from the blood to produce energy, water, and carbon dioxide.
14. is the transfer of gasses between the bloodstream and the cells of the body

1. smaller to allow space for the heart
2. is the transfer of oxygen and carbon dioxide between the environment and the bloodstream in the lungs
6. enter the lungs and then branch into smaller and smaller bronchial tubes called bronchioles
8. extends from the mouth and nose down to the bottom of the larynx, or voice box
10. is breathing out air.
12. is a small, leaf-like flap of tissue at the bottom of the laryngopharynx
14. is the process of breathing in air