What causes the lips to close and pucker during kissingand speaking?

The orbicularis oris muscle surrounds the mouth and is primarily responsible for the puckering of the lips. It’s one of the muscles involved in kissing, smiling, whistling and other facial expressions that involve the mouth.

Other muscles involved in kissing and speaking include:

* Zygomaticus major: This muscle raises the corners of the mouth, producing a smile or a kiss.

* Depressor anguli oris: This muscle pulls the corners of the mouth down, creating a frown or a pout.

* Levator labii superioris: This muscle raises the upper lip, often in expressions of surprise or disdain.

* Depressor labii inferioris: This muscle lowers the lower lip, often in expressions of sadness or disgust.

The combination of these muscles working together allows people to express a wide range of emotions, including love, joy, anger, and sadness. They also allow us to speak by forming different shapes with our mouths to produce different sounds.