Blastocysts and hCG----Objective 78

I would just like for you to know that I am laughing at myself right now.  Firstly because I just realized I am on my last objective and secondly because I just read the last objective and for the life of me could not "recognize that blastocyst secrete human gonadotropin".  I am so exhausted and mentally fried that  I could not figure out what in the world is human gonadotropin! And then it its me...duuuuhhhh...its the same hormone that you test for when you find out your pregnant!! Which is the same hormone that prolongs the life of the fetus...At this point I am glad I am laughing at myself and not crying.