What Is the AA-Curve

question 10

Essay

What is the AA-curve?
Why does it have a negative slope?
What factors cause it to shift?

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Definitions:

Rotate

The action of turning around an axis or center point, either in objects or in anatomical terms as movements of body parts.

Head

The upper part of the human body, or the front or upper part of the body of an animal, containing the brain, eyes, ears, nose, and mouth.

Sphincter

A circular muscle that controls the passage of substances through an opening in the body, such as the anus or the esophagus.

Orbicular

Shaped like a circle or orbit; referring to muscles that encircle openings in the body, such as the orbicularis oris muscle around the mouth.