Capillaries have thinner walls to absorb the nutrients and oxygen from the blood which flows through it and then transports it to the parts of the body which need the nutrients and oxygen to function.
The heart by itself isn't strong enough to move blood as far as it needs to go in the body. Arteries help by having elastic and muscular tissue that keep the blood moving. By contrast, veins are under very low pressure (no elastic tissue and very little muscular tissue) and they tend to run between muscle groups which, when they contract, squeeze the blood in the veins back towards the heart.
They must withstand systolic pressure.
Have thinner walls.
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.
Arteries have thicker walls than veins because they are carrying blood away from the heart and so, in a sense, are working harder. Veins have thinner walls and contain valves to stop blood flowing backwards.
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.
The arterial walls are thicker because they need to withstand the pressure coming from the heart.
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.
Arteries enter arterioles enter capillaries enter venules enter veins.
Only capillaries have permeable walls; veins and arteries are not permeable.
Arteries have thicker wall because the pressure in the arteries is much higher.
liquid can leak in and out of capillaries, and arteries and veins have such thick walls, and their jobs are just to bring blood to and from the heart. NO need for diffusion in these.
Yes
Yes, that is correct.