How does blood reach literally every cell in the body? There can’t be capillaries between every single cell when capillaries are also made of cells…. can there?

Question

How does this work?

In: 4868

Answer 1

Very few tissues in the mammalian body have direct supply of ‘whole’ blood – only kidneys, liver and heart muscle. A proportion of the fluid in whole blood passes out through the walls of capillaries to allow osmosis to transfer thousands of substances directly to and from all cells. This proportion doesn’t feed directly back into the bloodstream but, as wh0fuckingcares has said, is returned by the lymphatic system to the venous drainage close to the right side of the heart, mostly.