Question

6. Mention the role of the following:
a) Saliva in the mouth
b) HCI, mucus and pepsin in the stomach
c) Bile juice secreted from liver
d) Trypsin and lipase present in the pancreatic juice secreted by the
pancreas
e) Intestinal juice secreted by glands present in the walls of small intestine.
f) Sphincter muscle and anal sphincter.​

Answer 1

Answer:

(a) Pepsin: Pepsin is a proteolytic enzyme secreted in the stomach that is involved in the breakdown of proteins.

(b) HCl: HCl provides an acidic medium for food to be digested, it stops the activity of amylase and helps activate pepsinogen by converting it into its active form pepsin.

(c) Bile: Bile helps break down fats into fatty acids and also acts as a medium for excretion of bilirubin, a by-product of the breakdown of RBC's.

(d) Saliva: It has a lubricating effect and helps in swallowing and chewing food. Saliva also contains enzymes such as salivary amylase that helps break down starch into its simpler form.