The phase of swallowing that was most likely involved in the accidental swallowing of her gum is the pharyngeal phase.
There are different phases of swallowing is divided into three, namely:
The oral phase is voluntary while the pharyngeal and the esophageal phase is involuntary.
The pharyngeal phase involves the movement of the bolus of food from the oropharynx into the esophagus.
Since the Joanna accidentally swallowed her gum, it is an involuntary action of the pharyngeal phase of swallowing.
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