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Which came first, the heart, blood, or the veins?

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If you want to know how our circulatory system developed during the developments from single celled organisms to multi-celled larger organisms, please read this paper Evolutionary origins of the blood vascular system and endothelium. read more

So some kind of circulation developed, powered by peristaltic muscle action, after which a special organ, an equivalent of the heart, developed. So first a fluid (≈blood), then circulation (≈blood vessels), then pump (≈heart). read more

Nutritious fluid first (blood), then vessels and/or a pump (heart) (there are variations on whether a pump or vessels come first). read more

Most of the veins that drain blood from the heart muscles and structures empty into the coronary sinus, which is the main vein of the heart. It runs along the backside of the heart. The veins that flow into the coronary sinus include the great, middle, and small cardiac veins, the left posterior ventricular vein, and the left marginal vein. read more

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The blood vessels that move blood away from the heart are ...
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