Tag: Heart development

Remarkably, a human embryo's heart begins to beat as early as three weeks after conception, making it the first functional organ to develop. This rapid formation answers the crucial question: which comes first, lungs or heart?

During the first trimester of pregnancy, specifically between 4 and 7 weeks, a crucial process called cardiac septation remodels the embryonic heart from a simple tube into a four-chambered pump. This essential remodeling ensures the separation of oxygenated and deoxygenated blood, a fundamental step for the development of the circulatory system. This guide will explain what happens during septation and its significance.