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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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introductionstatpearls· Introduction· item NBK499934

The heart is the first functional organ that develops in humans and all other vertebrate embryos. The heart first begins to beat by week 4 of development. During the beginning stages of development, the embryo forms a trilaminar disc that matures into the looped heart along with its 5 regions.[1][2]