A live birth occurs when a fetus, whatever its gestational age, exits the maternal body and subsequently shows any sign of life, such as voluntary movement, heartbeat, or pulsation of the umbilical cord, for however brief a time and regardless of whether the umbilical cord or placenta are intact.
This definition of the term live birth was created by the world health organization in 1950 and is chiefly used for public health and statistical purposes. Whether the birth is vaginal or by caesarean section, and whether the neonate is ultimately viable, is not relevant to this statistical definition. The term live birth was in common use long before 1950.
In the United States, the term born alive is defined by federal statute.
Humans are bipedal with an erect stance and have, in relation to the size of the pelvis, the biggest head of any mammalian species, human fetuses and human female pelvises are adapted to make birth possible.
The erect posture causes the weight of the abdominal contents to thrust on the pelvic floor, a complex structure which must not only support this weight but allow three channels to pass through it the urethra, the vagina and the rectum.
The relatively large head and shoulders require a specific sequence of maneuvers to occur for the bony head and shoulders to pass through the bony ring of the pelvis. A failure of these maneuvers results in a longer and more painful labor and can even arrest labor entirely.
The first stage of labor starts classically when the effaced cervix is 3 cm dilated. There is variation in this point as some women may have active contractions prior to reaching this point, or they may reach this point without regular contractions. The onset of actual labor is defined when the cervix begins to progressively dilate.
The term video commonly refers to several storage formats for moving pictures digital video formats, including bluray disc, DVD, QuickTime, and analog videotapes, including VHS. Video can be recorded and transmitted in various physical media in magnetic tape when recorded as PAL or NTSC electric signals by video cameras.
Quality of video essentially depends on the capturing method and storage used. Digital television is a relatively recent format with higher quality than earlier television formats and has become a standard for television video.
sell my car | car dealer software | Hot Rod Art | traffic | auto body repair
Text Link Ads
