Page 60 - The Miracle of Human Creation

THE MIRACLE OF HUMAN CREATION

to protect the sperm on its journey in the mother's body. For example, in
the uterus various contractions and undulations occur. This uncommon
activity in the uterus and fallopian tubes facilitates the sperm's advance
towards the egg. The interesting thing about these contractions is the
substance that causes them. This substance is called prostaglandin and is
found in the seminal vesicle fluid that comes with the sperm from the ma-
le body. Despite the fact that it comes from a different body, this substan-
ce knows the structure of the mother's uterus and affects it in such a way
as to make the way easier for the sperm. 14
In order for fertilisation to take place, the changes that take place in
the uterus are not limited to these. During this period the tubes expand;
under the influence of the oestrogen hormones, the mucous membrane
that lines the uterus increases in size and weight. The epithelial cells
membranous tissues composed of one or more layers of cells separated by
very little intercellular substance proliferate. This structure in the mucous
assumes a shape that will permit the sperm to pass through these spaces
with the movement of its tail. Besides allowing the sperm to move easily,
this transformation has another very important function: the tissues serve
as a storage and filter area, allowing only normal sperm to pass. Someti-
mes the sperm do not have a shape that can ensure fertilisation. In this ca-
se, they are suspended in these tissues.
As can be seen from the foregoing, it is evident that every movement in

Sperm moving in the mucous