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Lumen is the same width as one RBC therefore more of RBC in contact with wall, therefore smaller diffusion distance 3. No muscle or elastic tissue 4. Tiny compare the scales and remind yourself what a m is Something extra youre supposed to know: The vessel taking blood to the kidneys is the renal artery The vessel taking blood away from the kidneys is the renal vein The vessel taking blood to the liver is the hepatic portal vein The vessel taking blood away from the liver is the hepatic vein Hepatic Portal Vein? The blood that goes to the liver comes directly from the gut, not from the heart, therefore, its not an artery but a portal vein. Why does this happen? It makes sense to send all blood from the gut directly to the liver because if there are any poisons in what youve eaten they get broken down by the liver before going around the body. Cunning, eh? O2 is excreted during photosynthesis and CO2 is excreted during respiration Excretion in Humans: Humans have 3 main excretory organs; 1. Lungs excrete CO2 and H2O 2. Skin excretes H2O 3. Kidneys excrete H2O, urea, excess minerals and other wastes. Extension - whats urea? However, we usually eat far more that we need, so we must excrete the rest.