Sentences with phrase «of fertilized eggs failed»

The study found that about 25 percent of fertilized eggs failed to survive past six weeks — so early that most of the women had no idea they had conceived.

Up to 80 % of all fertilized eggs fail to implant, and women have normal periods without even suspecting how close they came to being pregnant.

Not exact matches

When you consider the billions of fertilized eggs that never implanted or failed to thrive after implantation, you have to realize that nature (or god) does not hesitate to allow those potential people to be discarded en mass in the process of procreation.

Although the statistics on the failure rate of human fertilization are not entirely robust, given the biological and ethical delicacy of conducting research in this area, the numbers consistently suggest that, at minimum, two - thirds of all human eggs fertilized during normal conception either fail to implant at the end of the first week or later spontaneously abort.

To overcome that hurdle, glycobiologist Gary Clark of the University of Missouri School of Medicine in Columbia and colleagues obtained nearly 200 human eggs that were donated to research after they failed to fertilize during a type of infertility treatment.

The birth control pill, for example, prevents pregnancy in three ways: The pill thickens the cervical mucus to make it more difficult for sperm to reach the egg; it suppresses ovulation by mimicking pregnancy - level hormones in the body, preventing eggs from being released from the ovaries; and finally, as a fail - safe, the pill makes the lining of the uterus inhospitable to any fertilized egg that might slip through.