Some children ask their mothers where they came from. The mothers often jokingly reply, "You were picked up from a garbage dump." As they grow up, children understand that they were born after their mothers carried them for ten months, but they may not fully understand the story of the fertilized egg. Today, we'll talk about how a fertilized egg is formed, and the story of sperm and egg, giving you a clear understanding of your origins.
Every man's genitals produce tiny sperm cells, about 60 micrometers long, the smallest cells in the human body. These sperm cells have numerous segments; each time a man ejaculates, 200-500 million sperm cells are produced. This large number of sperm cells enter a woman's body with only one ultimate goal: to be the first to reach and fertilize an egg.
However, the process of sperm courting is not smooth sailing, but rather extremely arduous. First, it must overcome the test of endurance, taking 5-6 hours for the sperm to swim to the egg; second, it must overcome the test of "bride snatching," as only the strongest sperm can marry the egg, and it must defeat its brothers to win the egg's heart.
The egg that finds love is chosen from among many other eggs. Every month, a woman's ovaries produce multiple eggs, but not all of them mature. Only dominant follicles larger than 20mm can fertilize a sperm.
The one or two sperm that survive in the end have the following characteristics: excellent quality, active and strong, and full of intelligence; while the egg that fertilizes it is beautiful, healthy and fresh, and pure.
However, the sperm can only find the egg by chance, because it's impossible to know whether the egg will appear at the opening of the left or right fallopian tube this month. But the sperm shouldn't despair; the egg uses its magic to secrete progesterone, giving the sperm a clue to quickly swim to its destination.
The exciting moment has arrived! The strongest sperm and the best egg have combined to form a top-quality fertilized egg. The formation of this fertilized egg is a groundbreaking step in the birth of new life. Several essential steps must then be completed before it can truly develop into an embryo. On day 1 after fertilization, DNA begins to replicate; from days 2 to 4, cells begin to divide multiple times; on day 5, the embryo develops and differentiates into trophoblast cells and the inner cell mass; and from day 6 to 7, the blastocyst implants in the warm uterine lining and grows healthily.
The process of Mr. Sperm and Ms. Egg coming together could be written into a novel. Their love's fruit, the fertilized egg, will eventually grow into a full, healthy, and lively little baby, and be born after staying in the mother's womb for 10 months.
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