Once food is swallowed, what is the tiny flap of tissue that keeps food from entering the trachea called?
A. pyloric valve
B. esophagus
C. epiglottis
D. upper esophageal sphincter
Answer:C
Once food is swallowed, what is the tiny flap of tissue that keeps food from entering the trachea called?
A. pyloric valve B. esophagus C. epiglottis D. upper esophageal sphincter