Bad experiment - veins don't hardly stretch (no elastin in walls), what they do is collapse.
Have thinner walls.
Arteries enter arterioles enter capillaries enter venules enter veins.
The arterial walls are thicker because they need to withstand the pressure coming from the heart.
Arteries have thicker wall because the pressure in the arteries is much higher.
The more pressure it uses, the thicker the walls will be. Veins have very low pressure which means they have thin walls and vice/versa for arteries which have a higher pressure and thicker walls than veins.
Arteries and veins have much thicker walls compared to capillaries. The largest arteries and veins have walls up to 5 mm thick, while capillaries have walls that are only one cell layer thick.
1) Arteries carry blood away from the heart while veins carry blood to the heart. 2) Arteries have thick and muscular walls (as they have to endure higher pressure) whereas veins have thin and slightly muscular walls. 3) Arteries have no valves, while veins have valves. 4) Arteries (in the post-fetal human) carry oxygenated blood except for the pulmonary arteries. Veins (in the post-fetal human) carry de-oxygenated blood except for the pulmonary veins.
Arteries have thick elastic walls that can expand and contract, because they carry blood pumped from the heart. Veins return the blood to the heart but the pressure is not the same as in the arteries.
Relative to the walls of arteries, the veins' walls are thinner, because the pressure of the blood in the veins is much lower; so low in fact, that valves are required to prevent blood in the veins flowing backwards.
Because arteries are narrower, thus increasing the pressure in the arteries. So you need thicker walls to contain the blood under pressure.
Capillaries connect the smallest branches of arteries and veins The walls of capillaries are just one cell thick. Capillaries therefore allow the exchange of molecules between the blood and the body's cells - molecules can diffuse across their walls. This exchange of molecules is not possible across the walls of other types of blood vessel.
Yes