Why Are Aneurisms, or a Sac-Like Outpocketing of a Vessel

question 31

Multiple Choice

Why are aneurisms, or a sac-like outpocketing of a vessel wall, much more common in arteries than veins?

• A) Pressure against the walls of arteries is higher than the pressure against the walls of veins.
• B) Arteries have a thicker tunica media, making them more vulnerable than veins.
• C) Arteries have a thinner tunica externa than veins.
• D) Arteries have more vasa vasorum than veins, making the tunica externa weaker in arteries.