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

The fusion of sperm and egg is the most vivid and most important achievement of the union of men and women. At the beginning of life, these two tiny cells also need the right time and place to carry out their fusion. The male sperm, with its agile body and the male's responsibility, rushes to the front of the egg cell through many obstacles in life, knocks on the door of the egg cell in its own way, penetrates deeply into it, and fuses with each other, so that our 46 sex chromosomes can function normally and fully, and then gradually grow and develop. This is an extremely interactive process. Do you understand it during the pregnancy preparation period?

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

Do you know how sperm and egg meet and combine? During intercourse, the man ejaculates into the woman's vagina, and the sperm swims toward the uterus with its tail, and then enters the fallopian tubes. The man discharges about 200-400 million sperms each time, but most of them are discharged from the vagina with the semen. However, a large part of the sperm loses vitality or dies in the acidic and alkaline environment of the vagina, and only a very small number of sperm can get rid of the heavy friction and reach the fallopian tubes.

Since the cervical mucus is alkaline, it is beneficial to the activity of sperm. A small part of sperm moves forward with the help of the shaking of the tail end and quickly swims to the cervical tube. Sperm releases protein lysing enzymes to dissolve cervical mucus; uterine contraction and bilateral fallopian tube peristalsis caused by sexual intercourse accelerate the movement of sperm; the peristalsis of the bilateral fallopian tube muscle layer, the shaking of mucosal microvilli and the fluidity of the bilateral fallopian tube fluid metabolized by mucous cells cause the movement of sperm from the uterine cavity to the belly of the fallopian tube. At the final destination - the belly of the fallopian tube, it waits to fuse with the egg cell. It takes only a few minutes for male sperm to reach the fallopian tubes from the vagina at the fastest, 4-6 hours at the latest, and usually 1-1.5 hours.

It takes about 24 hours for sperm and egg to combine. When a capacitated male sperm enters the zona pellucida of a secondary coil oocyte, sperm and egg combination has just begun. When the sex chromosomes of the ovum pronucleus and sperm pronucleus combine together, it means that sperm and egg combination has taken place.

The average fertilization ability 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 (the middle of two menstrual periods).

What are the criteria for sperm-egg fusion?

How can sperm and egg fuse intact? To ensure successful fertilization, the following standards must be met:

1. The man's sexual function is normal and he can ejaculate normally.

2. The man has sufficient sperm with normal shape and function, as well as a liquid environment suitable for sperm movement.

3. Women can produce normal and complete oocytes, and both fallopian tubes are smooth.

4. Have normal sexual life around the time of female ovulation to ensure that sperm and egg cells have the opportunity to meet.