Fetal lungs are not functioning; no organism can start to breathe while immersed in amniotic fluid. Lungs only begin to function at birth.
When the lungs do not function the backup respiratory system takes over the function of the lungs. This is true in a fetal pig.
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Trachea
A fetal pig's lungs are similar to an adult's in the interior. The difference is that it is much smaller.
The pig has not yet used the lungs to breathe, so therefore they lungs have not been inflated and filled with air.
They Have Four Lobes
The pleura cover and protect the lungs in a fetal pig.
The trachea, heart, lungs, bronchial tubes, thyroid gland, and the larynx are found in the cavity of a fetal pig.
The fetal pig is in amniotic fluid. There is no air in the womb and the lungs do not inflate until the pig is born.
The diaphragm in a fetal pig attaches to the abdominal and thoracic cavity. It is used to help the pig breath.
No, the diaphragm does not function in a pig fetus. The pig fetus has no need to breathe prior to birth, it receives oxygen through the umbilical cord.