One day before conception the woman ovulates and produces one mature ovum. During the conception process one sperm out of millions by the man may penetrate the outside layer of the ovum and fertilize it. The start of pregnancy is about 10 days after conception. 14 days after conception it has now developed into the fetus central nervous system. Its heart begins to beat and at this time the woman might have noticed that her menstrual period is late.
CONCEPTION PHYSICAL Conception is the beginning of human development and happens when the sperm meets an egg. In the first month, the first two weeks will be the embryo attaching itself to the uterine wall. After 25 days, the baby’s body will start to develop (only the head, followed by the trunk and arm buds). The heart will also start beating. By 30 days, the baby will be a quarter of an inch long.
Some people may argue that the fetus is not human, if its not then what is it? Once the egg and the sperm unit, the 23 chromosomes of each parent are formed together to form one cell with 46 chromosomes. Once this cell has formed with 46 chromosomes the one cell has all the DNA, the fetus now has the entire genetic code that makes up a human being. III. Since the moment of conception these little babies are living inside of a womb and they are growing.
Embryonic Stem Cell Research A stem cell is a type of cell that can give rise to more cells of its kind, with at least one type of specialized cell. Human bodies possess different kinds of stem cells in different stages of life, and embryonic stem cells exist only in the first few weeks of human life, when humans are embryos. Embryos are fertilized eggs formed when a human egg and sperm fuse together and begin to undergo cell division. After about five days from the first division embryos develop into a hollowed-out ball of fluid that contains around 150 cells called a blastocyst. A part of the blastocyst will become the placenta, which will serve to nurture the growing embryo.
The placenta begins to form enabling the developing zygote to attach itself to the mother’s uterine wall. At this stage, oxygen and nutrients from the mother’s bloodstream is passed to the zygote, the wastes from the developing zygote pass into the mother’s bloodstream for elimination. In some few cases, when the fertilized ovum attaches itself outside the uterus, the mother suffers from what is known as ectopic pregnancy. This condition is very delicate and should be treated as a medical emergency since it can cause death. Embryonic stage This second stage starts from two weeks to two months.
From the moment when sperm fertilized an ovum, our destiny to be a girl or a boy was chosen. Usually at that moment; 23 chromosomes from the male donor and 23 chromosomes from the female came together and combined to make a zygote. Starting about six weeks into the pregnancy, our bodies begin to form into what they are meant to be, and after the seventh week, our genetic code (XY or XX) begins to really assert itself. It is said that by 36 months old, most children have a firm sense of their gender identity. Our genes and anatomic sex play an important role in determining
For fertilization to take place, sperm must be present either a couple of days prior to or on the day of ovulation. Sperm must first cross the barrier of the cervix, which will be thin and watery if the woman has just ovulated. Once the sperm have traversed the cervical mucus, they travel up the moist lining of the uterus into the Fallopian tubes. Since only one of the Fallopian tubes contains an egg, many sperm travel in the wrong direction. Fewer than 1,000 sperm out of the millions in the semen reach the Fallopian tubes, and only a few dozen actually reach the membrane of the egg.
Once sperm is released into the vaginal cavity, the little fellows sure have a long road ahead of them, and most never make it. They start to propel themselves by whipping their tales starting before they are ejaculated from the penis. Once they start, they continue on through the cervix and into the uterus where the fallopian tubes are. The journey of the sperm through the fallopian tubes is about six to seven inches, but can take several hours to accomplish. Once the sperm reaches the egg, mitochondria propel the sperm, and about 100 of his friends have made it to the eggs “outer wall” so far.
There are many different types of new reproductive technologies. The first of which is in vitro fertilisation, ‘which involves the fertilisation of an egg with sperm in a laboratory’ (Bos and Balen, 2010, 429). This process entails the fertilisation of an egg with sperm that then gets transferred into the mother’s uterus. There are a number of different combinations of this process, either using the father’s sperm with another woman’s egg, or vice versa. By having this new technology it allows couples that have one infertile partner to have children that are biologically related to the fertile partner.
Infancy and Early Childhood Development Theresa Clemons Psychology 375 March 11, 2013 Professor Lindsey Respress Infancy and Early Childhood Development Development of a child begins in the womb. The human fetus is defined as the unborn human during the stage of development. In this stage the fetus develops organs and grows many times its size during this time (E how Family, 2011). Once the child is born it is even more important that the environment is conducive for normal infant physical and mental growth. Infants experience the majority of its growth during the first year.