Subject: Does the body expel excess protein?

I looked through the archives and found a question that I wanted to ask 
(ID 954702424).  Unfortunately the answer didn't exactly answer the 
question, therefore I am submitting a more specific question.
Question:  A normal (~150pd indivi., with no health problems)can process 
(absorb, transport, and metabolize) a lot of protein in one seating (one 
seating = one meal ie. breakfast, lunch, etc...).  How many grams of 
protein can the body efficiency absorb (use)in one seating?  Train of 
thought: the body will expel exess XXX (such as vitamin) if too much is 
taken.  How much protein can be absorbed in one seating before the body 
expels excess (that is if the body does expel protein (amino acids and 
etc...))?  

Re: Does the body expel excess protein?