You Are Taking a Lab Practical Exam

Multiple Choice

You are taking a lab practical exam.One station has a microscope slide of a cross section through an artery and vein.Which vessel is the artery?

A) the vessel with the wider lumen (e.g.,interior space that contains the blood)
B) the vessel with more muscle tissue and elastic fibers in its wall
C) the vessel lined only with endothelium
D) the vessel with valves to prevent backflow
E) the vessel with a greater overall diameter