What function does the nasal cavity serve on the fetal pig?

In the fetal pig, the nasal cavity serves primarily as a passageway for air, facilitating respiration after birth. It is lined with mucous membranes that help moisten and filter the air, trapping particles and pathogens. Additionally, the nasal cavity plays a role in the sense of smell, which is important for the pig's development and interactions with its environment. However, in the fetal stage, the pig primarily relies on the placenta for oxygen exchange rather than breathing air.