| A | B |
|---|
| where air enters the nasal cavities | nares or nostrils |
| divides the nasal cavities into halves | septum |
| clusters of lymphatic tissue found in the pharynx; aid in the body's defense system | tonsils |
| re-enforce the trachea & prevent it from collapsing | cartilage rings |
| voice box | larynx |
| food passageway posterior to the trachea | esophagus |
| closes off the larynx during swallowing | epiglottis |
| numerous to increase the amount of gass exchange | alveoli |
| autonomic nervous system nerve serving the thorax | vagus |
| period of breathing when air enters the lungs | inspiration |
| period of breathing when air exits the lungs | expiration |
| loss of elasticity of the alveolar sacs; cannot rid themselves of carbon dioxide | emphysema |
| respiratory passageways narrowed by bronchiolar spasms | asthma |
| rhinovirus that causes excessive nasal secretion, congestion and sneezing | flu |
| respiratory volume inhaled or exhaled during normal breathing | tidal volume |
| total amount of exchangeable air | vital capacity |
| amount of air that cannot be forced from the lungs | residual volume |
| amount of air that can be exhaled forcibly after a normal exhalation | exhalation reserve volume |
| amount of air that can be inhaled forcibly after a normal exhalation | inhalation reserve volume |
| means of gas exchange at the lungs or body cells | diffusion |
