| Red Gold . Printable Page | PBS (456 words) |
 | In addition to humoral theory, Hippocrates and his followers set forth tenets that form the basis of much of Western medicine: disease results from natural as opposed to magical causes, patients should be observed and symptoms of disease should be noted, and physicians should adhere to a strict ethical code of conduct. |
| 350 BCE: Greek philosopher Aristotle believes that the heart is the central organ of the body and therefore the seat of the soul. |
| Dissecting and experimenting on animals, he proves that arteries contain blood, but also suggests that the system of arteries and veins are completely distinct, and blood forms in the liver and travels through the veins to all parts of the body and passes between the ventricles through pores in the septum. |
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