Slide 5 Medium Artery & Vein
Compare the thick muscular wall of the artery to the vein. Note that the lumen of the vein is slightly larger and commonly holds more blood.

Bar = 250 Microns

(This is from the mesentary. In your slide box, the Pacinian corpuscle slide often has good examples of vessels. See the Pacinian corpuscle in the lower right)
Expanded View