When did human life begin? Strictly speaking, it should be counted from the moment when the father\’s sperm successfully combines with the mother\’s egg, so it is said that the parents gave life to the fetus.
Women’s ovulation: After a woman enters sexual maturity, one follicle usually develops in each menstrual cycle Ovulation usually occurs between two menstrual periods, specifically about 14 days before the next menstrual period. After ovulation, the egg enters the ampulla, the thickest part of the fallopian tube, where it waits for sperm.
Men\’s ejaculation: A man\’s ejaculation can discharge hundreds of millions of sperm, which can reach the ampulla of the fallopian tube. No more than 200. The sperm swims in the fallopian tube for about 3 days and meets the egg in the ampulla on the outside of the fallopian tube.
Fertilization:Only one sperm can combine with the egg waiting in the fallopian tube to complete fertilization. The lucky man thrust his head into the egg cell, and the surface of the egg cell changed to prevent other sperm from entering. The process in which the sperm enters the egg and the pronuclei of both sexes fuse to form a new cell is called fertilization.
When sperm enters the zona pellucida of the secondary oocyte, it marks the beginning of the fertilization process. When the chromosomes of the spermatozoa and egg pronucleus fuse together. Indicates the completion of the fertilization process. The new cell is called a fertilized egg and is the beginning of a new life.
Understand the whole process of conceiving a baby
The fertilization of the egg is the beginning of pregnancy, and the delivery of the fetus and its appendages after maturity is the end of pregnancy. The whole process takes about 40 weeks.
The union of sperm and egg marks the birth of life, and the fertilized egg is the first cell of new life.
The fertilized egg formed in the ampulla of the fallopian tube takes about 4 days to be delivered to the uterine cavity through the peristalsis of the fallopian tube, which is called implantation. After the fertilized egg implants, the cells continue to divide to form an embryo.
About 3 weeks, the head and tail of the embryo separate into body segments.Bones and muscles form, and the human form begins to appear.
After 4 weeks, the embryo’s hands and feet begin to appear, and the head and trunk can be distinguished. The brain grows rapidly, the pituitary gland and the auditory nerve begin to develop, and the embryo’s blood circulation is initially established.
After 8 weeks, the heart, liver, digestive, urinary and reproductive organs are formed and developed, the heart is beating, and the face is formed. From then on, the embryonic period ends and enters the fetal stage. The fetus develops and grows in the uterus and is delivered from the mother\’s body after maturity until the pregnancy is full term.
The various organs of the fetus grow and develop rapidly in the mother\’s body, and they will mature in about 280 days.
This article is provided by Baidu Reading and is excerpted from \”Three Months Before Pregnancy – Pregnancy Preparation Period\” Author: Wang Liru