The Stages of Fertilization, Embryo, and Childbirth

The placenta produces hormones such as estrogen and progesterone that have the ability to prevent premature premature contractions and prepare the uterus for labor, produce hormones such as estrogen and progesterone, further produce hormones called placenta lactogens, blood circulation to mothers I will prompt you. Grape sugar Give her a baby. The placenta serves as a protective barrier to prevent microbes that cause the disease from mating with the baby. The placenta becomes an effective filter by separating the maternal blood from the fetal blood.

Argument: Person's development from the embryo is a continuous process, which begins as soon as eggs are fertilized. Since infancy is at the stage of human infancy, this is only the stage when humans are in the embryonic stage, the only fact is that it does not have any human characteristics at this stage. It will eventually become a person, so it should be respected. Discussion of objections: In vitro of the embryo has no psychological, emotional and physical characteristics before transplanting into the uterus. Therefore, interest can not be hindered and these can be used for the benefit of a patient as a human being. (Hug, embryonic stem cell research: moral dilemma, 2011)

The early stage developmental embryo is a living multicellular organism whose genetic code is independent of the genetic code of the mother and father of the embryo. Embryos derived from fertilization of human eggs and human sperm are human embryos. Therefore, the embryo is a human life. Under appropriate conditions for further development, healthy human embryos will develop secondary features of self-recognition, rationality, and language ability to distinguish human beings from other organisms.

Five days after fertilization, human embryos are like hollow spheres and contain 70 to 100 cells. In this developmental stage, the term human embryo is a blastocyst. If the embryo is attached to the uterine wall, the blastocyst is the human developmental stage, and the scientist calls this the implantation process. This usually occurs 7 to 10 days after fertilization. This attachment to the uterine wall allows the developing embryo to receive oxygen and nutrients from the mother, further promoting growth and development.

Embryos are formed specially for fertilization. Fertilized egg slowly develops into different embryos. The time required to implant a newly formed embryo is only 12 days, after which the development of organs will begin within 50 days. In other words, the standard definition during embryogenesis is 2 months after fertilization (Ostnor, 3). Embryo transplantation is as important as finding its failure and success. In particular, there is great interest in knowing the reasons for successful or failed embryo transfer. Various studies have been developed to identify factors that optimize the success of embryo transfer. Schoolcraft, Surrey, and Gardner (863) showed that avoiding blood, mucus, bacterial contamination, uterine hypercontraction, and endometrial trauma is associated with optimal pregnancy rate after embryo transfer It was.