Re: Why does the stomach of a fetal pig have anything in it?

Your urgency makes it hard for me to do any research. However, it seems to me 
that there really are only two possible sources of the substance you describe: 
either it is derived from the fluid that the animal develops in, the amnion, or 
from it is secreted by the lining of the stomach, mouth or nose. My guess is the 
latter, for two reasons. Your description fits mucus secretions better, and the 
amnion is a watery clear fluid. Secondly, there is not much fluid interchange 
through the mouth until birth - at least in people. That is why newborns get the 
"slap" to make them start crying - it is to get them to clear their airways of 
the amniotic fluid. By now you probably know the answer from your teacher, so 
you could tell me whether this was right or not.



(I appreciate your urgency - but I only received the question on the 16th of 
June, and it may take another day or so for the answer to get back to you.)