Respiratory System

3. A special leaf-like piece of cartilage closes the opening into the larynx
5. Also known as a windpipe, the bony tube that connects the nose and mouth to the lungs
8. Consists of two nostrils and is located on the face
9. The movement of air between the environment and the lungs via inhalation and exhalation
10. The passageways by which air passes through the nose or mouth to the alveoli of the lungs
12. The movement of molecules from an area of high concentration to one of low concentration
13. The primary organ of respiration
15. A muscle that is at the bottom of the ribcage which assists the lungs

1. Tiny hair like structures that filters the nose
2. The movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction
4. The drawing in of a substance into the lungs
6. The process that moves air in and out of the lungs
7. The large air tubes leading from the trachea to the lungs, carrying air to the lungs
11. A condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness
14. A hollow muscular organ forming an air passage to the lungs, the voice box