What is the structural difference between pulmonary vessel walls and systemic vessel walls?

The role of the pulmonary circulation is to take blood that is poor in oxygen and load it up with oxygen. It also takes the carbon dioxide content of blood and gets rid of it, that is you exhale it. One role of the systemic cirulation to deliver oxygen rich blood to where it is needed.

That is to say that cells need oxygen to do their work, the brain to think and the muscles to contract. They get their oxygen from the systemic circulation. But blood in the systemic circulation got its oxygen from being in the pulmonary circulation.

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