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The lumen size in an artery is smaller as it has a thicker Tunica Media to compensate for the greater arterial pressure; owing to the smaller lumen.
As to opposed to veins which has a larger lumen and a reduced venous pressure.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThe walls of blood vessels consist of different tissues. There is a lining of endothelium which helps the blood flow smoothly inside the lumen (hole), and some smooth muscle layers which allow the vessel to expand as the blood flows along it, and contract again behind the blood once it has surged passed. The walls have to give a bit to withstand the pressure of the blood flow, otherwise they would burst. Blood vessels also expand and contract to help maintain the total blood pressure in your body.
Arteries carry blood at high pressure because it has just been pumped by the heart, and so they need extra muscle thickness in the wall to cope with the expansion and contraction as the blood flows along them. The blood pressure in veins is lower and so the walls do not need to be as thick, but they contain tiny valves to ensure the blood can only flow one way i.e. back to the heart.
Veins are not darker in colour than arteries. They appear blue due to the colour of the tissues in the walls, NOT due to the colour of blood in them. Veins are closer to the surface of the body than veins which might lead to the belief that they are darker because you can see them more easily.
Wiki User
∙ 13y agoThe lumen is the hollow portion where blood is found.
Wiki User
∙ 10y agoBecause capillaries have to be small to be able to exchange co2 (carbon dioxide) and oxygen.
Wiki User
∙ 13y agoBecause their walls are so thick.
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What is the difference between an artery and a vein and what do they do?
Arteries are more elastic but have smaller lumen. They carry blood away from the heart. Veins are less elastic have larger lumen and have valves. They carry blood to the heart.
Which has less nitrogenous waste the renal vein or the renal artery?
The blood in the Renal Vein:* Is low in oxygen. * Returns to the heart. The blood in the Renal Artery:* Has high amounts of oxygen. * Is pumped from the heart.
Is Artery more thicker than vein?
the wall of an artery is usuallythicker that the wall of a vein.
How do you differentiate between an artery and vein in the liver?
The hepatic artery in the liver enters from the bottom and is much smaller in diameter than the aorta or the portal vein that it lies above. The hepatic vein exits the liver from the top, carries blood through the top portion of the liver, and is larger in diameter than the hepatic artery.
Which bleeds more artery or vein?
Yes, because there is more pressure in the artery than in the vein so the artery has to be big enough to hold the pressure that's inside it.
In comparing a parallel artery and vein you would find that?
The artery lumen is smaller the arterial wall is thicker the arterial pressure is much higher the arterial compliance is much lesser
What is the difference between an artery and a vein and what do they do?
Arteries are more elastic but have smaller lumen. They carry blood away from the heart. Veins are less elastic have larger lumen and have valves. They carry blood to the heart.
Which has less nitrogenous waste the renal vein or the renal artery?
The blood in the Renal Vein:* Is low in oxygen. * Returns to the heart. The blood in the Renal Artery:* Has high amounts of oxygen. * Is pumped from the heart.
Difference between artery and vein histologically?
arteries 've short lumen where as veins 've large lumen.
Is Artery more thicker than vein?
the wall of an artery is usuallythicker that the wall of a vein.
How do you differentiate between artery and vein in the liver?
The hepatic artery in the liver enters from the bottom and is much smaller in diameter than the aorta or the portal vein that it lies above. The hepatic vein exits the liver from the top, carries blood through the top portion of the liver, and is larger in diameter than the hepatic artery.
Is the artery bigger than a vein?
No the veins are bigger than the artery
Why pulmonary is an artery rather than vein?
in our body there are both, pulmonary artery and pulmonary vein
Double lumen PICC line colors and what they mean?
Double-lumen PICC lines come in two colors. Red is the blood access lumen or arterial lumen and blue is the blood return lumen or venous lumen. Despite the names, neither lumen is leads to an artery, but both lead into a vein.
How do you differentiate between an artery and vein in the liver?
The hepatic artery in the liver enters from the bottom and is much smaller in diameter than the aorta or the portal vein that it lies above. The hepatic vein exits the liver from the top, carries blood through the top portion of the liver, and is larger in diameter than the hepatic artery.
Tiny blood vessels joining artery with vein?
the smallest blood vessel is the capillary, then the vein, and the artery. (vein and artery depends though because when they diffuse they get smaller and close to the same size) but the smallest will always be the capillary.
Why the artery has a thick layer muscle then vein?
Because there is more pressure on the artery wall (from the heart) than that of the vein.
