The species theory, polygenism, held that human races were of different lineages and suggested a hierarchy outlined in the Chain of Being that positioned Africans between man and lower primates.
No, they are involved in the Circulatory System which is responsible for pumping and channelling blood to and from the body and lungs with heart, blood and blood vessels. no veins are not considered an organ because they are a grouping of different tissues like a organ.
Be careful when classifying parts of the body. The heart is an organ, as is the liver, lungs, etc. An organ is a group of tissues that function together for a main purpose. The heart's purpose is delivering nutrients to the body and returning wastes for removal. Muscle is considered a tissue, which is part of an organ.