[Answer] What is the first functional organ in a vertebrate embryo?

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The heart is the initial functional organ in both humans and vertebrate embryos. It starts beating around week 4 of development. During the early stages, the embryo forms a trilaminar disc that transforms into the looped heart with five regions. It begins pumping blood around day 21-22, emphasizing its vital role in nutrient, oxygen, and waste exchange. The prominent heart bulge on the embryo's surface underscores its early development.

Heart development in vertebrate embryos is complex, beginning with the heart tube from mesodermal cells. These cells differentiate into atria, ventricles, and valves, while the cardiac conduction system regulates the heartbeat. Vascularization ensures blood supply, connecting the heart to the circulatory system via the aorta and pulmonary artery. Remarkably, the heart starts contracting early, supplying essential oxygen and nutrients. As the embryo matures, the heart grows, becoming the first fully functional organ, essential for sustaining life.

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