Compare the following:
Pulmonary circulation concerns the right side of the body; it pumps blood to the lungs to get oxygen and gives off carbon dioxide. The arteries carry deoxygenated blood to the lungs, and veins carry oxygenated blood to the heart. Systemic circulation concerns the left side of the body; it pumps blood throughout your whole body. The artieries carry oxygenated blood to the whole body and the veins carry deoxygenated blood to the heart.
Arteries have a thicker wall (because they have a larger middle layer), and they have arteriole. Veins are larger in diameter, have a thinner wall and have venule and valves. Similarily, they both have 3 layers and the middle layer is a smooth tissue.
FETAL CIRCULATION
DUCTUS VENOSUS: ambillical vein attaches to vena cava
DUCTUS ARTERIOSIS: between pulmonary trunk and aorta-makes sure blood doesn't go into the lungs of the fetus.
FORAMEN OVALE: helps RA&LA - acts as lungs & digestive system for fetus
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