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plmonary veins begin as capillaries and end as capillaries
In muscles and other body tissues, there are capillary beds which connect arterial supply and venous return. Arteries end as capillaries in the body tissue, where blood dumps oxygen and nutrients for use by muscles. At this point they are considered arterial. They may also pick up waste products to carry away. By the end of the capillary beds, they are depleted and considered venous. They flow continuously into the veins which flow back to the heart. The heart sends this blood to the lungs to pick up oxygen and the cycle continues.
All veins lead to the right atrium of the heart. After the right atrium, blood goes into the right ventricle then the pulmonary arteries to the lungs. All venous emboli will eventually end up in the lungs.
The capillaries are contained within the dermis and and nutrients that the epidermis requires diffuses up to it.
They pick up oxygen
If you're not getting enough protein in your diet the body turns on itself and starts to consume it's own proteins. These are the structural proteins in cells and tissues and the soluble proteins (including blood proteins, enzymes, antibodies and the like). This leads to loss of tissue and a reduction in the concentration of blood proteins. These soluble blood proteins - found in the plasma - are responsible for creating the osmotic pressure which draws tissue fluid into the capillaries. The reduction in the osmotic pressure gradient between blood and tissue fluid means that more fluid leaves the capillaries at the arterial end and less is re-absorbed at the venous end of the capillary network. The fluid then builds up in the tissues, a condition known as oedema.
Chorionic Villi with Fetal capillaries Intervillous Spaces Decidua basalis with maternal capillaries
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Because that is where all of the venous blood runs through just before it enters the lungs and becomes re-oxygenated. So it is the most mixed up venous blood in the body.