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

Question

Quizplus · Accepted Answer

Arteries have thicker walls which are composed of muscle tissue and elastic fibers that help to pump the blood through the circulatory system. Veins have thinner walls and are often equipped with valves to prevent backflow. The size of the lumen, diameter, or endothelium lining is not always a reliable indicator for distinguishing between the two.

You Are Taking a Lab Practical Exam