How long does it take for sperm and egg to fuse?

The fusion of sperm and egg is the most vivid and important achievement of male and female union. At the beginning of life, these two small cells also need the right time and place to complete their fusion. With its capable body, male sperm has the responsibility of crossing many obstacles in life to reach the egg cell, knocking on the door of the egg cell in its way, and merging deeply within it, so that our 46 sex chromosomes can function normally, and then slowly grow and develop. This is an extremely interactive process. Do you already understand it when you are preparing for pregnancy?

How long does it take for sperm and egg to fuse?

Do you understand how sperm and eggs meet and fuse? During intercourse, the man ejaculates his semen into the woman's vagina, and the male sperm travels toward the uterus with the help of its tail end, and then enters the bilateral fallopian tubes. A man discharges about 200-400 million sperms every time. However, most of the sperms are discharged from the female vagina along with semen. However, a large proportion of sperm lose their vitality or die in the acid-base environment of the vagina. Only a very small number of sperm can overcome heavy friction and reach both fallopian tubes.

Because the cervical mucus is alkaline, which is beneficial to male sperm movement, a small number of male sperm move forward with the help of the shaking of the tail end and quickly swim to the cervical canal. Male sperm releases proteolytic enzymes to dissolve cervical mucus; uterine contractions and bilateral fallopian tube peristalsis caused by sexual intercourse accelerate the movement of male sperm; peristalsis of the bilateral fallopian tube muscle layer, shaking of mucosal microvilli, and fluidity of bilateral fallopian tube fluid metabolized by mucus cells cause male sperm to move from the uterine cavity to the ampulla of the fallopian tube. At the end point - the ampulla of the fallopian tube, it waits for fusion with the egg cell. It only takes a few minutes for male sperm to reach both fallopian tubes from the vagina, the latest is 4-6 hours, and usually 1-1.5 hours.

It takes about 24 hours for the sperm and egg to combine. Sperm-egg union begins when a capacitated male sperm enters the zona pellucida of a secondary coil oocyte. When the sex chromosomes of the egg pronucleus and sperm pronucleus are combined together, it means that the sperm-egg union is in progress.

The average fertilization capacity of sperm is 48 hours. Therefore, due to the limited activity of egg cells and sperm, the effective time of pregnancy is very short, limited to the middle of the menstrual cycle (between two menstruation).

What criteria are required for sperm-egg fusion?

How can sperm and egg fuse intact? To ensure successful completion of insemination, the following criteria must be met:

1. The male’s sexual function is normal and he can ejaculate normally.

2. Men have sufficient sperm with normal shape and function, as well as a liquid environment suitable for male sperm to vibrate.

3. Women can produce normal and perfect eggs, and both fallopian tubes are smooth.

4. Have normal sexual life around the woman’s ovulation period to ensure that male sperm and eggs have the opportunity to meet.