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. Author manuscript; available in PMC: 2013 Aug 19.
Published in final edited form as: Head Neck. 2011 Sep 9;33(0 1):S30–S36. doi: 10.1002/hed.21902

Figure 1.

Figure 1

The upper aerodigestive tract has two primary functions: breathing and swallowing. (A) Upper aerodigestive tract valves positioned (open) for directing airflow through systems. (B) Upper aerodigestive tract valves positioned (closed) for safely directing bolus flow. (Adapted from Easy to Swallow, Easy to Chew Cookbook: Over 150 Tasty and Nutritious Recipes for People Who Have Difficulty Swallowing by Weihofen D, Robbins J, and Sullivan PA. 2002, with permission of John Wiley & Sons, Inc.)