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I am not sure if I am asking question that is hard to answer precisely. I just have begun learning about anatomy and physiology and have watched bunch of human dissection videos online. I feel like sometimes introductory college biology courses get so stuck in teaching about the details and mechanism of biological processes that I have trouble envisioning the bigger picture of what is being explained.

I specifically am confused about the organization of blood vessels in a living human/animal body. Like when I watch dissection videos, it is very easy to see with naked eyes the larger blood vessels like aorta, the arteries that emerge out of it and runs downwards towards the diaphragm and lower body. so on and so forth. But i find trouble coming across resources explaining how and where (or what location in the body) they start splitting into smaller vessels. Like how are arterioles and capillaries organized in the body? Are arterioles microscopic just like capillaries. Do these smaller blood vessels run through the inside of every organs, muscles, cells (like extracellular space) etc...?

If someone can explain this or point me to any sources/topics that can explain this, I would greatly appreciate it. Thanks.

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