An elastic band around the arm constricts blood flow in the veins, causing them to engorge with blood and become more prominent. This temporary increase in pressure pushes more blood into the veins, making them appear larger and more visible. The band also reduces the return of blood to the heart, enhancing the visibility of superficial veins. This technique is often used in medical settings to facilitate venipuncture.
artery walls have more elastic tissue and smooth muscle than veins,
arteries thick walled and elastic blood vessels capillaries and veins
Because blood in veins is under lower pressure than in arteries, so they do not need as many collagen fibres. In addition, as veins already have a wide diameter, they do not need to dilate that much hence they also dont contract that much (as opposed to artieries), so they have less elastic recoil, thus they have less elastic fibres. :)
arteries thick walled and elastic blood vessels capillaries and veins
As people age, the walls of veins may become less elastic and more rigid due to changes in the structural proteins within the vein walls. This can cause the veins to narrow or become smaller in diameter. Additionally, the accumulation of fatty deposits or plaques within the veins can contribute to their narrowing.
Temperature has little, if anything to do with vein visibility. You can see veins at any given time (usually), if you look at your wrist or anyplace the skin is thin.
Contraction of veins would increase venous return to the right atrium. It would increase the efficiency of the heart pumping.
elastic tissue, I had this question as part of my online assignment, I answered it and it was correct ;)
veins have many thin layers with circular elastic and muscle fibres and a wide lumen
yes they do have it......according to me but u should consult it to some other sites as ell
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.
Elastic arteries, muscular arteries, arterioles, capillaries, venules, medium veins and large veins