A question to do with heart and its health

Hello everyone.

I am not studying at university, I am in high school and I don't even study anything to do with medicine.

I study electronics, it's my hobby and I spend a lot of time doing it. Every time looking for new challenges, new ideas, innovation, invention. I've ever loved repairing things, turning them alive again, and not only machines and electronic devices, I like to make anything work correctly again.

That's why I am pretty interested in medicine, actually I have very interesting ideas of projects I will gradually do related to it, you may have seen that many measurement devices are electrical.

A project I am working in is a really innovative one and it works directly with and in the veins.

I wonder, because I don't really know much about the cardiovascular system, would it be a problem to cut a vein and to replace it with another material (with proper qualities to avoid cholesterol problems when it gets stuck)?

Does heart suffer overload (be forced) when you try to move anything with its force? Cholesterol would be an example. The heart would try to move the blood and it needs a higher effort, but what's the limit? A little bit of effort shouldn't be bad (as everyone has at least a little bit of stuck cholesterol), am I right?


I would be thankful if you could give me an idea using your knowledges.

Hope you understand what I say, just ask me if did not.