Paper on the Three Trimesters of Pregnancy

885 Words4 Pages
The First Trimester takes place from the first week to the 13th week of pregnancy. Fertilization takes place when, in most cases, one sperm is able to make its way through the fallopian tube and burrow into the egg. Once fertilization occurs, the egg will change so that no other sperm can burrow into the egg. The sperm and egg form a new cell known as a zygote. Right when fertilization occurs, all of the child’s genes are set. Fertilization starts pregnancy. Blastocysts are thin walled hollow structures that contain a cluster of cells called the inner cell mass, where the embryo will form. Implantation is when the blastocyst attaches itself to the wall of the uterus. The embryo will remain one until the eighth week of pregnancy, when it becomes a fetus. During the First Trimester the placenta and umbilical cord develop. These together bring nutrients to the fetus, and also removes waste from the fetus. The Placenta also releases the Human Chorionic Gonadotropin Hormone (HCG), HCG helps to maintain pregnancy and it affects the development of the baby. The Amniotic Sac also develops, which is a fluid-filled membrane that supports the developing fetus. During the First Trimester, the child will develop limb buds, which are the beginning of the arms and legs, along with developing; fingers, toes, ears, ankles, wrists, and eyelids. The child’s heart will begin to beat around the 25th day after conception. The child also begins to develop all of its major organism, and its neural tube, which connects the brain to the spinal cord. Usually home pregnancy tests are accurate after the first day of a woman's missed period. Pregnancy tests search for HGC in the urine. During the First Trimester of pregnancy, women will experience “morning sickness” which is when women have extreme nausea, especially in the morning. Women also tend to experience abnormal fatigue during the first
Open Document