Answer:
Digestion
of food occurs as
(i) Mouth (Buccal cavity) The mouth contains teeth, which crush the food
into small particles.
Salivary glands are present, which secrete an enzyme
called salivary amylase.
(1)
(ii) Stomach Gastric glands are present in the wall of the
stomach which release
(a) Hydrochloric acid To make the medium acidic for the
action of enzyme pepsin.
(b) Mucous To protect the inner lining of the stomach from
the action of acid.
(c) Protein digesting enzyme pepsin.
(2)
(iii) Small intestine It is the site of complete digestion
of carbohydrates, proteins and fats. It receives secretions from liver and
pancreas.
(a) Bile juice It is secreted by liver.
It performs the following functions
It makes the medium alkaline for the pancreatic enzymes to
act.
It breaks down large fat globules into smaller globules.
(b) Pancreatic juice Contains enzymes like trypsin for
digesting proteins and lipase for breaking down emulsified fats.
(c) The walls of small intestine release intestinal juice.
(2)
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