The Biology of Pregnancy .
The beginning of human life has inspired wonder and
curiosity in scientists and lay persons alike. There is evidence that in prehistoric with the birth of a baby. As a result , many theories of a mystical son grew up to explain birth. The Greek Philosophers and Physicians, on the other hard were aware that sexual intercourse always preceded pregnancy though they did not know exactly how this led to the production of a new life. On the basis of their knowledge they evolved the theory that the woman was the receptive soil in which the seed from the male was planted. It was not until the seventeenth century that the period degrade a Ducth physician, suggested that the woman supplied an egg. A few years later, a Dutch spectacle maker , Van Leerwenhock, reported that Little animals , or what are known as sperm cells, were contribution to the new human being.
How Human Life Begins
We now know that each microscopic sperm is composed of a pointed head and tail. The head contains the genetic material necessary for reproduction. The tail moves like a whip and enable the sperm cell to swim towards the ovum (egg cell ) . Like the sperm, the ovum cell to swim towards the ovum (egg cell) . Like the sperm, the body cells, that contains genetic materiel. In comparison with body cells, the ovum is quite large 0.12 milli meters about the size of the period at the end of this sentence. The first step in the development of a single human being is the moment of conception or fertilization when the sperm cell from the father unites with the ovum from the mother to from a single cell. This single cell is called a zygote. Conception marks the beginning of pregnancy. The process of the conception may sound simple when it is put into one sentence, but since the sperm and the ovum both have to be in the right place the same time, it is more it is mote complicated than it sounds .