Page 45 - Biology Form Two

Biology for Secondary Schools

Salivary gland
Mouth
Pharynx
FOR ONLINE READING ONLY

Oesophagus

Liver
Gall bladder Stomach
Duodenum Pancreas

Ileum Colon
Appendix
Rectum
Anus

Figure 2.1: Digestive system of a human being

The digestion process continues in the stomach where the small
particles swallowed from the mouth
Task 2.2 are further broken down into smaller

Search the library and internet sources particles. The chemical breakdown of
the animations about the human digestion food into simpler molecules is done by
process. Observe the animation and chemical substances called enzymes.
describe the digestion processes in the Enzymes are produced by the glands
mouth, stomach, duodenum and small found in the mouth, stomach, small
intestine. intestine, and pancreas. The break
down of food into smallest particles is
necessary to enable nutrients and organic
Digestion involves two sub-processes,
which are mechanical and chemical molecules obtained from the food to be
absorbed and utilised in the body.
breakdown of food nutrients. The
mechanical digestion process takes place Digestion in the mouth
in the mouth, where large food particles The process of digestion begins in
are chewed by the teeth and broken the mouth and continues through the

down into small particles. The process alimentary canal that extends from the
mouth, pharynx, esophagus, stomach,

Student’s Book - Form Two
39

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BIOLOGY FORM 2 NEW.indd 39 05/10/2024 15:36:21