Which of the Following Statements Are True of the Pharynx

Multiple Choice

Which of the following statements are true of the pharynx and esophagus (Select all that apply) ?

A) Peristalsis of the esophagus is part of the swallowing reflex.
B) The oropharynx and laryngopharynx are passageways for both food and air (at different times) .
C) The lower esophageal sphincter (LES) is usually contracted,except when something is swallowed.
D) No digestion takes place in the pharynx or esophagus.