BIOL 155 Lecture Notes - Lecture 24: Ligamentum Arteriosum, Ductus Arteriosus, Umbilical Artery

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27 Nov 2018
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Ubc biol 155 lecture 22 notes reproductive system. The first problem faced by the newly born infant is breathing. The first breath requires considerable effort since the lungs are still fluid filled and the surface tension must be overcome to fill the lungs. As discussed in earlier lectures, with the first breath, surfactant is distributed throughout the alveolar fluid and subsequent breathing becomes much easier. The umbilical arteries and vein constrict during birth. The outer segments fibrose and are eventually sloughed off. The inner segments are either re-routed to serve as functional vessels to parts of the body cavity or collapse and are eventually converted into ligaments. Several important shunts exist in the developing fetus that allow blood to bypass the pulmonary circulation since the lungs are not functional in utero. It is important at birth that these now be sealed.

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