The process of conversion of complex food substances to simple absorbable forms by mechanical and biochemical methods is called digestion.

The type of attachment where teeth are embedded in the socket of jaw bone is called thecodont.

The three major parts of stomach are

(a) Cardiac into which the oesophagus opens.

(b) Fundus which is commonly filled with air or gases.

(c) Pylorus which opens into small intestine (posterior part of stomach).

Gall bladder is not associated with the bile formation rather it is involved in the storage of bile. Bile is secreted from the hepatic cells of the liver.

(a) Goblet cells are located in the intestinal mucosal epithelium and secrete mucus.

(b) Fats are broken down into di and monoglycerides with the help of lipases.

Fats $\xrightarrow{\text { Lipases }}$ Diglycerides $\longrightarrow$ Monoglycerides.

(c) Gastric glands of stomach mucosa have oxyntic cells which secrete HCl

(d) Saliva contains enzymes that digest starch.

$$\text { Starch } \frac{\text { Salivaryamylase }}{\mathrm{pH} 6.8} \text { Maltose }+ \text { Isomaltose }+\alpha \text {-dextrins }$$