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Unformatted text preview: Introductory Anatomy: Circulatory System & Blood Perhaps the most important thing to remember about the circulatory system is its variability. This is because of the way the circulatory system develops: the early embryo is essentially a blood filled sponge - intricate network. Most of this is removed during development, leaving remnants governed by highest flow and pressure. Its plasticity is also shown by migratory organs: if an organ moves during development eg the kidney it will take its nerve supply with it, but acquire a new local blood supply - successive segmental arteries of the kidney as it rises may persist as 'abnormal' renal arteries. Sensible place to start is the heart , complicated at first glance so let's reduce it to a diagram: four chambered, atria and ventricles in one way communication. Right half circulates blood from body to lungs, left half circulates blood from lungs around body. This has immediate implications: the pulmonary circulation is rather small, little peripheral resistance,...
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