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gaseous exchange through umbilical cord post-birth

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Placenta - Wikipedia, the free encyclopedia
It connects to the fetus by an umbilical cord of approximately 55–60 cm . bathes the fetal villi in blood, allowing an exchange of gases to take place. . Deoxygenated fetal blood passes through umbilical arteries to the placenta. . Women's blood serum will be completely negative for hCG by one to two weeks after birth.
http://en.wikipedia.org/wiki/Placenta

Cutting the Umbilical Cord
Cutting The Umbilical Cord: UK Midwifery Archives . Where are the figures on gaseous exchange through the cord post-birth? Is this perhaps theoretical .
http://www.midwifery.org.uk/index.php?option=com_content&view=article&id=238:cutting-the-umbilical-cord&catid=91:hidden-archives&Itemid=110

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Changes at birth
With birth, a change from parallel flow through the heart to a serial one gradually takes place. . The gas exchange takes place in the baby's lungs. By cutting the umbilical cord, the placental circulation system is switched off. . After a few weeks or months this shunt via the ductus arteriosus is definitively obliterated and the .
http://www.embryology.ch/anglais/pcardio/umstellung02.html


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Initiation of pulmonary gas exchange by fetal sheep in utero
lung gas exchange can occur in the absence of sensory and . 20 min after birth more than 50% of the fetal lung fluid . performed, the fetal head and chest were exposed through . before and after umbilical cord occlusion and release was .
http://jap.physiology.org/content/62/3/989.full.pdf

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Neonatal Transitional Physiology: A New ... - Cord Clamping Info
Early clamping of the umbilical cord at birth, a practice developed without . Gas exchange and acid-base adjustment may continue during this transition. When . the uterus within a few minutes after birth. In the 1930s, Brandt,58 using dye .
http://cordclamping.info/publications/Theory%20NNT%2002.pdf

Medline ® Abstract for Reference 18 of 'Umbilical cord blood acid ...
Placental compared with umbilical cord blood to assess fetal blood gas and acid- base . cord blood sampled from a clamped segment of the umbilical cord after delivery of . placental and umbilical cord blood measurements were described using a . blood gas exchange within and across the placenta after cord clamping.
http://www.uptodate.com/contents/umbilical-cord-blood-acid-base-analysis/abstract/18


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Placental Compared With Umbilical Cord Blood to Assess Fetal ...
The sampling of blood from the umbilical cord at the time of delivery is an important . Data analysis is presented using all patients studied, because there were no . gas exchange after the cessation of umbilical blood flow with cord clamping .
http://journals.lww.com/greenjournal/Fulltext/2005/01000/Placental_Compared_With_Umbilical_Cord_Blood_to.23.aspx

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placenta: Definition from Answers.com
The umbilical cord attaches it to the fetus at the navel. . Similarly, the placenta has equivalent functions to the kidney after birth in permitting the . to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.
http://www.answers.com/topic/placenta

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