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I used to think that arteries had thin walls and low blood pressure and veins had thick walls and high blood pressure, and now I think the opposite.

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I used to think that the system of arteries and veins had equal pressure, but I now know that Arteries have to handle higher pressures

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I use to think that

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I used to think that blood vessels all had similar physical properties, but I now know that capillaries, veins and arteries have different properties and their functions are all different.

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I used to think that the left side of the body was just full of arteries but it turns out that the pulmonary section of the body just wants to mess us up

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I used to think that arteries and veins were very similar. Now I see that there are many more difference than I first thought as well as quite a few similarities

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I aLSO know that the blood vessels in our body are very structurally specific in order to carry out their functions properly

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Blood vessels have various wall thicknesses to support pressure of blood flowing also to support diffusion of oxygen. They also have valves to prevent back flow of deoxygenated blood. I used to think blood vessels are similar but infact they have adaptations for their purposes

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I used to think that all blood vessels had similar physical properties, but now I know they all have different features.

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I used to think that arteries and veins were similar in function, but now I see how the different thicknesses and features can change the way they work

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Used to think that arteries were under high pressure because they were carry oxygenated blood, but it's mainly due to the fact that the heart is contracting and pushing blood everywhere. 

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Used to think that arteries were under high pressure because they were carry oxygenated blood, but it's mainly due to the fact that the heart is contracting and pushing blood everywhere. 

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I use to think that blood vessels where neat perfect circles now I know that in real life they are not

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I used to think that all blood vessels had similar structures, because they all do the same task, transporting blood. But now I know that they have different structures to support their function in the circulatory system.

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all arteries and veins functioned almost the same way but now I know that they don't because they have different properties

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veins and arteries transferred blood on size and structure alone but now realize that muscle and pressure play into transporting the blood.

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I used to think that blood vesels transfer blood due to the size of the muscle and how much the muscle needs to function. Now I think that muscle groups actually just have more capillaries which are one cell thick walls to help transfer oxygen and minerals

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I used to think different types of blood vessels are not very different and they only function on their own, but now I know they have different traits and they work together to support the circulatory system.

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I think that different blood vessels are adapted differently to perform functions in the circulatory system.

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Blood vessels and capillaries have different structure to support the system and for their function. Capillaries have thin walls for good absorption, veins have thin walls for working under low pressure, and arteries have thick muscular walls for high pressure. Arteries and veins are actually different to each other for different functions.

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I used to think that veins bring blood away from the heart and that arteries return blood to the heart (I got mixed up).

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for some reason, it's still not showing up, can you please make sure you add this in. 

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for some reason, it's still not showing up, can you please make sure you add this in. 

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I used to think the same thing - that arteries have thicker walls to support higher pressure, and capillaries are one cell thick to support diffusion.

However, I now also think that these functions help the circulatory system through supporting the double pump system of the heart, meaning that these structures support the movement of blood to the lungs (lower pressure) and from the heart to the rest of the body (higher pressure for extremities)

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Artery- thick elastic wall and a small lumen to support the high blood pressure
Vein - thin walls and large lumen --- i didn't know that they have a one way valve
Capillary - Has single cell to allow diffusion - i didn't know that  the rbc in them are also one cell think

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I used to think the same