what are the differences between a vein and an artery? Give your answer with reference to specific examples.
I don't know how to refer to specific examples...please help me..
Arteries take blood from the heart, while veins bring blood back to the heart. Because of this their construction differs.
Since this is not my area of expertise, I searched Google under the key words "veins vs. arteries" to get these possible sources:
https://www.google.com/search?client=safari&rls=en&q=veins+vs.+arteries&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.