Your professor says something profoundly funny.You are tempted to laugh but because you failed to brush your teeth this morning all you can do is to manage a closed-mouth smile.What muscle are you primarily using?
A)Risorius
B)Platysma
C)Mentalis
D)Levator labii superioris
E)Buccinator

Question

Quizplus · Accepted Answer

The risorius muscle is primarily responsible for pulling the corner of the mouth outward to create a smile, especially a closed-mouth smile, as described in the scenario.

Your Professor Says Something Profoundly Funny