Small Arteries and Arterioles Anatomy Quiz

• The size of the lumen
• The presence of an internal elastic membrane (IEM) (correct)
• The thickness of the tunica adventitia
• The type of smooth muscle cells in the tunica media

• It is the thickest layer of the vessel wall
• It contains the internal elastic membrane (IEM)
• It regulates blood flow to the tissues
• It is a thin, ill-defined sheath of connective tissue that blends with the connective tissue in which these vessels travel (correct)

• The endothelium is thinner in small arteries/arterioles
• The endothelium is absent in small arteries/arterioles
• The endothelium is thicker in small arteries/arterioles
• Gap junctions may be found between endothelial cells and the smooth muscle cells of the tunica media (correct)