cell
It is known that the human body consists of different devices, but remains the cell is the structural and basic unit, which consists of the body organs and organs, and the cell consists of several parts called cellular organelles, and remains the most important part of the cell is the nucleus, the nucleus is located in the center of the cell and control, Chromosomes containing genes through DNA. Human chromosomes consist of twenty-three pairs of chromosomes, twenty-two of which are chromosomes, one is a sexual pair through which the sex of the fetus is determined by a male or female, in addition to the inheritance of the parents.
Pregnancy stage
The menstrual period lasts about twenty-eight days and begins on the first day of menstruation. Throughout this period, ovarian follicles continue to ripen, usually in the middle of the cycle. One of the oocytes, called the graphene vesicle, prepares to fertilize the egg with a process called ovulation, Only minutes. The egg falls from the ovary to the peritoneal cavity where it is caught in the fallopian tube. The rest of the follicle collapses and wrinkles into the yellow body, the progesterone-producing gland. This hormone, if fertilized, will take responsibility for the embryonic development.
The egg then begins to travel through the fallopian tube to the uterus. It is ready to be fertilized for approximately twenty-four hours. If intercourse takes place at this time, it starts to meet about 100 million sperm, each consisting of: head, tail, , And the journey to the egg is about forty-five minutes, where the majority of sperm cells die, and survive only two hundred of them, where the meeting occurs in the widest part of the fallopian tube, and sperm try to penetrate the wall of the egg, which consists of nucleus, cytoplasm, Transparent, radial crown, when you can A sperm from penetrating the cytoplasm of the cell at this moment can be considered as the beginning of pregnancy.
Fetal shape in the first month
Within a week of fertilization, the fertilized egg will find its way into the uterus. The egg will be about the size of the pen’s head. Within days, the cells inside the egg itself will be grouped into groups. The internal cells will become a child. The amniotic sac will form from the outer cells and the placenta. Called hatching and disappearing into the wall of the uterine uterus, and by about the fifth week is your baby, which grows the size of the semen, and begin cells that previously formed fertilized egg from the mass of internal cells organized and arranged to give the young embryo form and form members The baby’s brain and spinal cord can be seen through its translucent skin. At this time, the fetus’s circulatory system is formed and its heart begins to throb. The embryo appears closer to the frog’s little chick than to the human form. It pulls nutrients and oxygen through the placenta and umbilical cord Newly formed.