Multiple Choice
Which structure is found in the central region of a longitudinal section of the spinal cord?
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1. Introduction to Anatomy & Physiology
Introduction to Organ Systems
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Which of the following correctly lists the layers of a typical artery from innermost to outermost?
A
Tunica externa, tunica intima, tunica media
B
Tunica media, tunica intima, tunica externa
C
Tunica media, tunica externa, tunica intima
D
Tunica intima, tunica media, tunica externa
Verified step by step guidance1
Understand the structure of a typical artery: Arteries are composed of three layers, each with distinct functions and characteristics. These layers are organized from the innermost to the outermost.
Identify the innermost layer: The tunica intima is the innermost layer of an artery. It consists of endothelial cells that line the lumen of the artery, providing a smooth surface to reduce friction for blood flow.
Identify the middle layer: The tunica media is the middle layer of an artery. It is primarily composed of smooth muscle and elastic fibers, allowing the artery to regulate blood pressure and flow by contracting or relaxing.
Identify the outermost layer: The tunica externa (also called tunica adventitia) is the outermost layer of an artery. It is made of connective tissue that provides structural support and anchors the artery to surrounding tissues.
Combine the layers in order: From innermost to outermost, the layers of a typical artery are organized as follows: tunica intima, tunica media, tunica externa.
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