what kind of gland? ??? ??? ??? stomach Where does protein digestion begin? ??? ??? ??? proteins the enzyme pepsin is primarily concerned with the digestion of what? ??? ??? ??? Amino acids What are the building blocks" of protein molecules? ??? ??? ??? Incisors, canines, molars, premolars What are the 4 major types of teeth found in the human mouth? ??? ??? ??? touching the diaphragm; left The