Pig lungs.
Lungs collect oxygen.
The main function of a pig's trachea is to breathe. It is part of system of passages that allow air into the lungs.
When the lungs do not function the backup respiratory system takes over the function of the lungs. This is true in a fetal pig.
A fetal pig's lungs are collapsed because they are filled with fluid while in the uterus. This allows for easier passage through the birth canal and prevents the lungs from being damaged during development. Once the pig is born and takes its first breath, the lungs expand and fill with air.
chest cavity
At birth
smoothe
Jews do not eat a pig at any time of the year, so they do not eat a pig on Hanukkah either.
so pigs can breathe.
rib cage
Trachea