2007-10-10 07:47:34 · 4 answers · asked by claire f 1 in Science & Mathematics ➔ Biology
arteries have a muscular layer to provide better control of blood flow to the body. The more a arterial muscle contracts the smaller the lumen and the greater the pressure, and vice versa. Veins do not regulate blood flow to the body, they simply return the blood back to the heart, and therefore have no muscular wall for that control.
2007-10-10 08:01:40 · answer #1 · answered by texandc2002 6 · 0⤊ 0⤋
they are elastic for a while but they stop after repeated rise and fall in pressure!
i would imagine (and this is just a guess) that the collagen in the vein rips when the vein has to stretch so it doesn't return to the original shape!
good luck!
2007-10-10 08:17:25 · answer #2 · answered by Anonymous · 0⤊ 0⤋
unlike arteries veins actually have valves that assist in moving the blood through the vessels - therefore they do not need the function of elasticity
2007-10-10 07:54:00 · answer #3 · answered by erin b 1 · 0⤊ 0⤋
To be able to maintain proper pressures.
2007-10-10 07:53:29 · answer #4 · answered by Lady Geologist 7 · 0⤊ 0⤋