The expansible portion of an atrium is called a(n) ________ because it reminded early anatomists of the external ear.

A) atrial sinus
B) coronary sulcus
C) atrial apex
D) interatrial groove
E) auricle


Ans: E) auricle

Anatomy & Physiology

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Indicate whether this statement is true or false.

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Matrix is composed of ________.

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