The first organ which is formed and began to function during the embryonic periods is the heart. In fact, when the embryo could no more support its nutritional requirements just by the simple diffusion from the placenta, the heart appears as a new organ.
CITATION STYLE
Dabbagh, A., Amini, A., Abdollahifar, M. A., & Saghafi, M. A. (2017). Cardiovascular system embryology and development. In Congenital Heart Disease in Pediatric and Adult Patients: Anesthetic and Perioperative Management (pp. 11–64). Springer International Publishing. https://doi.org/10.1007/978-3-319-44691-2_2
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