Digestion begins in the mouth when food is chewed and starch is broken down by ptyalin, an enzyme secreted in saliva.
(Digestion; begins; L:in the mouth; T:when food is chewed and starch is broken down by ptyalin) (food; is chewed; ) (starch; is broken down; by ptyalin) (an enzyme; secreted; L:in saliva)
Digestion food starch an enzyme
begins is chewed is broken down secreted
L:in the mouth T:when food is chewed and starch is broken down by ptyalin
by ptyalin
L:in saliva