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Unit 2Nutrition and
the digestive
system
(Part 2)
Biology and Geology
3º ESO
,5 The digestive system
What is the role of the digestive system?
The digestive system is a set of organs
that perform the task of digestion.
Digestion consist of transforming food into simpler
substances (nutrients), which can be absorbed and
used by cells.
,5 The digestive system
Anatomy of the digestive system
The digestive system consists of:
- The digestive tract, a tube through
which food passes.
- The glands, that release their juices
into the digestive tract. Some are
located outside the digestive tract
(accessory glands), and others are
located in the walls of the digestive tract.
, 5 The digestive system
Anatomy of the digestive system
▪ Digestive tract
It is a tube about 9 metres long, through which food
passes. Its shape varies (it narrows and widens).
It starts in the mouth and ends at the anus, and it has
the following parts:
• Mouth
• Pharynx
• Oesophagus
• Stomach
• Small intestine
• Large intestine
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