Mastodawn

dyanam0 Mar 15, 2024

https://phys.org/news/2024-03-discovery-reveals-egg-sperm-entry.html
#humanreproduction #egg #sperm #infertility #contraception

New discovery reveals how the egg controls sperm entry

After the egg has been fertilized by a sperm, the surrounding egg coat tightens, mechanically preventing the entry of additional sperm and the ensuing death of the embryo. This is according to a new study led by researchers at Karolinska Institutet and published in the journal Cell. The work also explains how mutations in egg coat proteins can cause female infertility and may eventually lead to new contraceptive methods.

Phys.org

Wm.son Feb 29, 2024

#Science #Biology #HumanReproduction

Science and data loaded, but:

Early human embryo mortality is a matter of considerable interest not only to reproductive biologists and fertility doctors, but also to philosophers 1, 2, theologians 3 and lawyers 4.

Most especially, becoming pregnant and having children is of overwhelming and personal importance to many women and their families. As with all biological processes, nothing works perfectly all the time 5, and failure to conceive and pregnancy loss are common problems.

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