Please help, will fan and medal!
A(n)____________ can withstand high blood pressure due to the thickness of its __________ and __________.

vein; smooth muscle; elastin
vein; smooth muscle; tunica intima
artery; smooth muscle; elastin
artery; valves; tunica externa

Question

Please help, will fan and medal! 
A(n)____________ can withstand high blood pressure due to the thickness of its __________ and __________.

 vein; smooth muscle; elastin
 vein; smooth muscle; tunica intima
 artery; smooth muscle; elastin
 artery; valves; tunica externa

alphadxg · Answer

guess?

hahawowoh · Answer

I want to say the second choice?

alphadxg · Answer

meh I wouldn't say so :P

Arteries would need to be able to withstand more pressure than veins :P

hahawowoh · Answer

So my second guess is the third choice

hahawowoh · Answer

@alphadxg

alphadxg · Answer

Well, question could be either, Honestly since all components are found. I do think that Answer 3 is key since elastin is very important for blood pressure.

anonymous · Answer

I don't know but this might help. http://apchute.com/ap2chap/chapt19.htm