← Chapter 20
Anatomy & Physiology · Chapter 20
Blood Vessel Structure
The wall of an artery or vein has
three layers
, called
tunics
. They wrap around a hollow center. Tap each layer from the inside out.
Lumen
cut across · inside → outside
Vessel structure
three tunics
The layers
📷 Reference image
A real labeled picture to compare with the activity above.
Blood Vessel Structure — OpenStax, CC BY 3.0 (via Wikimedia Commons)
