The Process of Pregnancy

The pregnancy process by which the single-cell human embryo (called a zygote (zi’got),1 becomes a 100 trillion-cell (1014) adult is perhaps the most remarkable phenomenon in all of nature. Studying human development from fertilization to birth, means that we will see these body parts and body systems emerge . We also learn when many routine body functions begin. Human development is a continuous process beginning with fertilization and continuing throughout pregnancy, birth, childhood, adolescence, adulthood, and into old age. The process of pregnancy preceded by a process of fertilization of the egg cell united with sperm cells or spermatozoa and the results will form a zygote. zygotes started to divide one cell into two cells, two cells become four cells and so on. On the fourth day of the zygote becomes a lump cells that are ready to attach to the lining of the cavity the uterus (endometrium). Pregnancy begins in this process. On the seventh day the lump was organized into layers cells surrounding a room that contains a group of cells in the inside. Most pregnancy lasts about 40 weeks (280 days) and no more than 43 weeks (300 days). gestation which took place between 20-38 weeks of pregnancy is called preterm, whereas when more than 42 weeks of pregnancy are called postterm. According to age, pregnancy is divided into three, namely pregnancy first trimester 0-14 weeks, the second trimester of pregnancy 14-28 weeks and the third trimester of pregnancy 28-42 weeks.