What structures in the body transport blood through the cardiovascular system?

artery

vein

trachea

lungs

The arteries carry blood away from the heart; the veins carry it back to the heart.

B.veins

slitherio is the original. its the best friend of all middle schoolers. the man you can count any time you have some free time. slitherio is the guy you hang with while you're in the computer lab suppose to be doing "research or whatever". slitherio isn't just a game but a friend.

wormaxio is just a fake trying to squeeze its way into the friend group. trying to pretend its cool and your best pal but how long has it really been there for you, really. it only wants you as friend to boost its social status. wormaxio is just annoying fake pleb. no offense

you and have a wonderful day

answer; both surfaces of the membrane are nonpermeable