Respiratory System

2. a muscle that helps you inhale and exhale (breathe in and out)
6. an expiration of air from the lung
8. taking deeper breaths than usual, which increases the volume of air in the lungs
10. either of two external openings of the nasal cavity in vertebrates that admit air to the lungs
11. the action of inhaling or breathing in
12. As lung volume increases, pressure decreases as per Boyle's law

1. paired linings, located within the thoracic cavity, that surround each lung and separate them from the thoracic wall
3. a state in which oxygen is not available in sufficient amounts at the tissue level to maintain adequate homeostasis
4. cavities within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities
5. any of the major air passages of the lungs which diverge from the windpipe
7. any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange
8. rapid or deep breathing, usually caused by anxiety or panic
9. a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs