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Is the diameter of the lumen larger in arteries or in capillaries?
Arteries have the largest diameter, then arterioles, and last, capillaries.
How can a atherosclerosis plaque affects coronary circulation?
occlusion of the internal lumen of the (vasa=arteries)dellay of the blood cicrulation
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.
Are arteries less compliant than veins.?
YES! veins are more compliant than arteries. it means they are more capable of adopting their lumen size with changes in blood volume inside their lumen .when blood volume increase inside a vein lumen it easily expands and accepts whatever amount of blood reach and when blood volume decreases squeezes and adopt its lumen size for that amount of blood . but when we are talking just about arteries and want to compare one artery to another artery ,we should know that aorta is most compliant artery,remember the farther away from heart the less elastin in artery wall hence less compliance.
Which vessel would have a larger lumen an artery or its corresponding vein?
Veins have a much larger lumen compared to arteries, this is for several reasons: Blood in the arteries has left the heart (with exception to the pulmonary artery) much sooner than the blood in veins, therefore it is under much more pressure, so needs more muscle tissue around its walls to a) cope with that pressure and b) to aid the heart in pumping blood. Blood in veins has much lower pressure, meaning it needs less muscle tissue around the walls, leaving much more room for a hollow lumen (which is lined with valves to prevent backflow of blood).
