Sperm viability in utero

Description:A number of differences however need to be accounted for when comparing natural selection versus different ART. In any case, the surviving sperm will linger about the entrance and lower portions of the fallopian tubes, holding out the best they can for the egg to arrive. The withdrawal method, or when the male "pulls out" of the female before ejaculation, is notoriously unreliable. An additional factor, likely a sperm surface protein or proteins, is required by each sperm for it to pass through the junction Nakanishi et al.

Views: 6583 Date: 2018-09-09 Favorited: 87