(i) Human liver is bilobed and weighs about 1.2 to 1.5kg.
(ii) pH of gastric juice is 6.8 while the pH of saliva is 1.8.
(iii) Saliva contains amylase, lysozyme and electrolytes.
(iv) Each lobule of liver is guarded by sphincter of Oddi.
(v) Digestion is initiated by ptyalin and it hydrolyses about 30% starch in oral cavity.