Sperm uterine contractions
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The uterus of domestic animals, including the horse, has a dual role in the interaction of the uterus and sperm. Fertilization — sperm union with the egg — occurs in this portion of the tube. The selection of sperm for the small numbers of "good" cells that gain access to the oviduct and for the majority of sperm that will be destroyed takes place in the uterus. The question, of course, is whether women actually exercise this control. In the in vitro fertilization IVF process as well, an embryo may begin to develop but not make it to the blastocyst stage — the first stage at which those cells destined to become the fetus separate from those that will become the placenta.
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After conception, the uterus waits below, for about seven days, as the newly fertilized egg takes its own sweet time to float into the womb, and then the uterus goes into action again. The single-cell embryo is called a zygote. Defects in the fallopian tube may impair transport and increase the risk of a tubal pregnancy, also called ectopic pregnancy. But being evolution, the plan does not always work well, and women are betrayed by their uteruses and often end up having children with the wrong fathers. Apparently, uterine contractions squirt fluid, and sperm, upwards. Once the egg arrives at a specific portion of the tube, called the ampullar-isthmic junction, it rests for another 30 hours. Small March 8,
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Effect of seminal plasma on uterine inflammation
But as David Elad of the Department of Biomedical Engineering at Tel Aviv University, Israel, has recently discovered, the uterus, like everything else on Earth, is subject to the laws of motion. The seminal plasma is left in the vagina. If the woman has had sex, the ovary might meet a sperm high up in the fallopian tube, and this might seem like a passive process from the uterus's point of view. But being evolution, the plan does not always work well, and women are betrayed by their uteruses and often end up having children with the wrong fathers.
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