Osmosis from Elsevier - During fetal life, the lungs are filled with fluid and have high vascular resistance, so they don't participate in gas exchange. Instead, the placenta serves as the organ
![Non-invasive evaluation of placental blood flow: lessons from animal models in: Reproduction Volume 153 Issue 3 (2017) Non-invasive evaluation of placental blood flow: lessons from animal models in: Reproduction Volume 153 Issue 3 (2017)](https://rep.bioscientifica.com/view/journals/rep/153/3/images/large/R85fig1.jpeg)
Non-invasive evaluation of placental blood flow: lessons from animal models in: Reproduction Volume 153 Issue 3 (2017)
![Establishment of maternal blood supply to the placenta: insights into plugging, unplugging and trophoblast behaviour from an agent-based model | Interface Focus Establishment of maternal blood supply to the placenta: insights into plugging, unplugging and trophoblast behaviour from an agent-based model | Interface Focus](https://royalsocietypublishing.org/cms/asset/2d2a7107-7702-49ff-a06a-b956ed77cb85/rsfs20190019f01.jpg)