Biology on Instagram: "Prenatal development. The process by which a human life forms and grows inside the womb, unfolding in three main stages. The germinal stage (weeks 1–2) begins with fertilization, as the zygote travels to the uterus and implants itself. During the embryonic stage (weeks 3–8), the major organs and body structures begin to form—such as the brain, heart, and spinal cord—while the heart starts beating and facial features emerge. Finally, the fetal stage (week 9 to birth) is mar

Smart Doctor Plus on Instagram: "Close Up of a Beating Heart | (Full) 🫀 . . The human heart is a vital organ that pumps blood throughout the body, supplying oxygen and nutrients while removing carbon dioxide and waste products. Here are some key points about the human heart: Anatomy: The heart has four chambers: two upper atria and two lower ventricles. The right side pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the rest of the body. Valves: There are fou