Exam 23: Circulation and Respiration

Read the following scenario to answer the following questions. Yawning is a reflexive action that is often associated with sleepiness. When a person yawns, the mouth opens, and a longer than normal breath of air is inhaled, followed by a longer than normal exhalation. Hypothesizing that yawning has a regulatory mechanism similar to breathing, scientists conducted an experiment on college students to test the effect of ambient carbon dioxide levels on yawning. -The structure where the respiratory and digestive systems meet expands during a yawn.What is the name of this structure?

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