Lesson 9.1 Crossword


3.the two passageways that branch off the trachea and lead to the right and left lungs
8.the structure consisting of hard and soft components that separates the oral and nasal cavities; the roof of the mouth
10.the air-filled cavities that surround the nose
11.a flap of cartilaginous tissue that covers the opening to the trachea; diverts food and liquids to the esophagus during swallowing
13.the muscular passageway that extends from the nasal cavity to the mouth and connects to the esophagus; the throat
14.the thin-walled branches of the bronchi; the smallest air- conducting passageways of the bronchi. The terminal bronchioles conduct a small amount of gas exchange in the respiratory zone.
15.a triangular-shaped space inferior to the pharynx that is responsible for voice production; the voice box
16.the collective name for the respiratory and cardiovascular systems; these systems work together to conduct gas exchange


1.three uneven, scroll-like nasal bones that extend down through the nasal cavity
2.air sacs in the lungs from which gas is exchanged with the capillaries
3.the thin, double-walled serous membrane that surrounds the lungs
4.the area of the thoracic cavity between the lungs; houses the heart, great blood vessels, trachea, esophagus, thoracic duct, thymus gland, and other structures
5.the two openings in the nose through which air enters; nostrils
6.small openings in the alveolar walls that allow gases and macrophages to travel between the alveoli
7.clusters of lymphatic tissue in the pharynx that function as the first line of defense against infection
9.a phospholipid that reduces the surface tension in the alveoli and prevents them from collapsing
12.the air tube that extends from the larynx into the thorax, where it splits into the right and left bronchi; the windpipe

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