However, the laboratory blood test is more reliable. Under optimum circumstances, and with optimum sperm health, a few sperm can live up to about five days, but that is rare. The time required for the egg to develop the proper follicle necessary for ovulation is about fourteen days. Of course, these delaying mechanisms can do more harm than good in infertile couples if events do not allow the invasion of sperm to be mounted successfully. Here, the FertilAid for Men Clinical Study showed statistically-significant improvements in sperm motility. Sperm enter the zona pellucida at an angle almost exactly perpendicular to the surface of the egg and appear to develop a channel within the zona as they move forward. If sperm can, on the other hand, make it into cervix and womb, their chances of survival are vastly increased. Remember, since the egg is only fertilizable for about twelve hours after ovulation, it is important to have a continuing flow of sperm across the tube so that whenever the egg appears, there will be sperm available. Since the human body functions to procreate, the egg that is released monthly from the ovaries waits for sperm cells in the fallopian tube for about a day.
This protects the fertilized egg from the entrance of extra chromosomes called polyploidy , which would cause a genetically impossible fetus, and a miscarriage. Any sperm that have not penetrated the cervical mucus within a half hour after orgasm will not be able to do so later on, because by then they will have lost their ability to swim into the more friendly environment of the cervix. It is wise to wait a sufficient amount of time about one week after a missed period to take a home pregnancy test. The brain secretes small pulses lasting only a minute or so of the hormone GnRH about every ninety minutes in both men and women. In these cases, the female will either need to take medication to stop the embryo from growing, or have surgery to prevent the fallopian tube from rupturing. In this sense, the canal of the cervix can be looked upon as a receptacle through which platoons of spermatozoa migrate and in which some are detained in order to ensure a continuous supply of smaller numbers, over a prolonged period of time, to the deeper recesses of the female where fertilization takes place. Thus far, only a superficial description of what happens during a menstrual cycle has been given: Ovulation Before egg and sperm can ever meet up in the fallopian tube, the egg must be matured and extruded from the ovary in a process called ovulation. Then the complicated barrier mechanisms provided by nature to allow a slow, continuing flow of a small number of sperm at any moment is not necessary and the large numbers of sperm normally required for fertilization through intercourse are not needed. When the ovaries are stimulated to make more eggs by administering FSH a necessary step in the in vitro fertilization process , the tremendous increase in estrogen production over a normal level can cause an early increase in LH secretion. When trying to become pregnant, eating well , staying healthy, tracking ovulation , and age can play a role in the chances of pregnancy occurring. Generally, the most fertile eggs are released earlier in life, and of her limited supply of four hundred thousand, about one thousand eggs will die inexorably every month. If no pregnancy develops, the corpus luteum ceases to produce progesterone by ten to fourteen days after ovulation, and subsequently disappears. Many sperm can be seen attempting to enter the egg in competition with the one that made it first, but their efforts are in vain. It is the periodic, never-ending release of GnRH from the brain that causes the pituitary gland to start secreting FSH and LH, bringing on puberty, including menstruation in girls. LH triggers the chromosomes of the egg to separate and thereby prepares the egg genetically for fertilization. On the first day of menstruation the pituitary hormone FSH is already stimulating development of a follicle that will take precedence over all other follicles that month. Formation of the Follicle Each month, from the time of sexual maturity on, about one thousand undeveloped eggs, or oocytes, leave their prolonged resting phase and start to mature. Some of it, however, remains in the back of the vagina in the posterior fornix and an even smaller amount makes its way up through the cervix, into the uterus and down the fallopian tubes. Cervical mucus is absent or very scanty during most of the monthly cycle, gradually becoming more abundant around the middle of the cycle, under the influence of increasing estrogen levels,when ovulation is about to occur. GnRH is chemically a very simple hormone called a polypeptide, which can be easily synthesized by drug companies. For some females, a positive pregnancy reading is exciting news, while other females might not be ready to have a baby or never wish to. Also at this moment the outer zona pellucida becomes transformed into a rigid barrier so impenetrable that other sperm, despite all the chemicals in their acrosomes, cannot possibly enter. From there, the journey begins. This initiation of development is a continuous process, in marked contrast to ovulation, which occurs only once a month.
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The difficult journey of the sperm
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