Renal vein is larger than renal artery, isn't it?
824219
Arteries are major vessels that carry blood away from the heart.  Veins are major vessels that carry blood toward the heart.   Blood pressure is less when carried toward the heart, therefore your answer is artery=larger.  The more pressure needed , a larger part it will be  Veins are thinner and less resistant to blood flow...
480429
A pulmonary vein is called a vein only because it brings blood back to the heart.  However, the blood that it transports back to the heart is oxygenated (contains oxygen).  All other veins carry deoxygenated blood (blood without oxygen).  The pulmonary veins as well as the pulmonary arteries are special because they carry different types of blood then the typical vein or artery.  For another example, the pulmonary artery carries deoxygenated blood.  Arteries carry oxygenated blood, however, this particular artery (the pulmonary artery) carries deoxygenated blood because it is moving from the heart to the lungs so as to get oxygen from the lungs.  Then the blood will travel back through the pulmonary veins (with oxygen in it--oxygenated).  So as you can see, the name of the pulmonary veins and pulmonary arteries has a lot to do with whether it brings blood back to the heart (veins do this) or it takes it away from the heart and out to the body (arteries do this).  If you try not to focus on what type of blood it is (oxygenated or deoxgenated) you may get confused less.  The pulmonary veins and pulmonary arteries can be confusing if you think about what type of blood they're carrying.  They are the exceptions to the typical vein or artery.
622613
veins and arteries have different jobs...veins carry blood to the heart and arteries carry blood away from the heart to the cells, tissues, and organs of the body.\n\nCould you possibly word your question another way, because I'm not sure I get what it is you're trying to ask.
935401
Heart, arteries, veins.
235244
blood rushes to it and makes it bigger...
80241
There are two major arteries in the leg....the Femoral which extends from above the knee through the top of the thigh and the Tibial which extends from the femoral through the lower leg....and there are three major veins in the leg and foot...the Tibial which runs from the feet to the thigh..the Saphenous and Femoral which both run from knee to pelivs through the thigh.
438401
kidney, specifically the nephron
1082307
Check it out... I can answer seriously...\n\nI gave my kidney away to a friend 8 or 9 years ago. Honest and no joke. Our tissue matches up like brothers and he has not had an issue with rejection. My kidney dr. is all pissed at me though for not drinking enough water through the day... kidney stones and all...\n\n I have often wondered about the tissue though. What is the DNA of the grafting and connecting tissue from my old kidney to his body anyway?\n\n I won't even go into the spiritual side of it... Yes the Bearded One has a spiritual side...\n\n I'm watching this question though. Nice to know I'm not the only one who has thought about this...\n\nIf you ever want to give up a kidney however, Swedish Med on the hill in Seattle is THE BEST!!!\n\n The actually made me a steak, Rare! AT 4:AM!!!\n\nI also proposed to a nurse while in the morph drip... that was fun.\nGetting the cath out was a pain...\n\n But I'd do it again.
967182
The two blood flows would not be the same.  Think of the cross-sections of the blood vessels as circles. At a constant pressure, the amount of blood carried increases in proportion to the area of the circular cross-section.\n\n4mm blood vessel:-\nArea = pi x square of radius\n= 3.14 x 4\n= 12.56 sq mm\n\n2mm blood vessel:-\nArea = pi x square of radius\n= 3.14 x 1\n= 3.14 sq mm\nso two 2mm blood vessels = 3.14 x 2\n= 6.28 sq mm\n\ni.e. exactly half the amount of blood would flow through the two smaller vessels compared with the one larger vessel.\n\nIn practice, the greater surface area of the walls of the two smaller vessels would cause greater resistance and reduce the blood flow relative to the larger vessel so that the flow would be somewhat less than half.
835862
Good grief, you need some basic understanding of human anatomy: without a blood supply nothing can live outside the human body. When organs are transplanted they are held suspended on ice in coolers in solutions made to mimic body fluids.  Kidneys cannot live outside the human body and must be connected to a blood supply to function.\n\n A fish breathes water through its gills and cannot live on land unless it is amphibian, in which case it is not a fish. A fish is nothing remotely resembling a human kidney.\n\nhttp://en.wikipedia.org/wiki/Amphibian
1090690
Is the blood definitely vaginal? It may be related to your urine infection, as blood in the urine  can indicate kidney infection\n\nS
894662
Well break the words down. Capillaries are closer to the surface of the skin, that is where gases exchange and where waste is disposed of. Veins are a little deeper and have more pressure on them, they are returning blood back to the heart.\nSee you have arteries, veins, and capillaries.\nThe arteries are the pipes going out of the heart, they have the most pressure on them. Because they have to deliver all the blood with the o2 in it to the capillaries all over your body. After the gas exchange at the capillary level, it then turns in to your veins, that return to the heart.
840066
Actually, air injected into VEINS is not usually problematic unless a lot of air is injected, so you probably wouldn't die at all.  On the other hand, air into an artery is much more problematic.  Look up 'air embolism'.  Bottom line is that it depends on your state of health ( don't believe the movies).
682226
Are they attached?  They are adjacent to the kidneys, but I am not sure they are attached.\n\nhttp://upload.wikimedia.org/wikipedia/en/b/b0/Kidney_section.jpg\n\nhttp://d-mis-web.ana.bris.ac.uk/calnet/potdse/page2.htm\n\nhttp://www.merck.com/mrkshared/mmanual_home2/fg/fg164_1.gif
617025
http://en.wikipedia.org/wiki/Blood_vessel
341450
found this at the site below:\n\nMy only suggeston is start from the heart and work through ascending aorta, carotid and brachial arteries, descending aorta and its branches namely superior, middle and inferior gastrointestinal arteries, renal arteries, uterine areteries and iliac arteries and their branches the femoral arteries. For veins, start with heart and do superior vena cava and its tributaries the cerebral and arm veins and the lymphatic duct, then inferior vena cava and its tributaries the portal and hepatic veins, the renal veins, the gastrointestinal veins, the uterene veins and the femoral veins with their tributaries the superficial and deep saphenous veins. \n\nDavid Richardson
1022189
Excercise more, it increases your blood flow, vein capacity and thus increases your size of veins.  You sort of want your veins to be able to allow for higher volumes of blood, it allows the heart to work less.