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What's the difference between a "happening" and an "experience?"
Sympathetic Nerve Fibers
Part of the autonomic nervous system that prepares the body for stress-related activities.
Tunica Media
The middle layer of the wall of a blood vessel or hollow organ, composed mostly of smooth muscle and elastic fibers, responsible for regulating the diameter of the vessel.
Blood Vessel Walls
The structures that form the boundaries of blood vessels, consisting of layers including the endothelium, smooth muscle, and connective tissue.
Elastic Arteries
Arteries that contain elastic fibers in their walls, allowing them to stretch and recoil as blood is pumped through them by the heart.
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