Science ยท Chapter 12 ยท ICSE Class 5

The Digestive System

Food takes a long journey through your body before it becomes energy. Tap each organ to follow the path food takes.

The Digestive Journey Explorer

Tap an organ to begin

Follow food's journey from the Mouth to the Large Intestine.

Try it: tap them in order to follow food's full journey!

12.1

Why do we need to digest food?

Digestion is the process of breaking down food into tiny parts the body can absorb and use for energy, growth, and repair. Without digestion, the body couldn't use the nutrients locked inside the food we eat.

Everyday example โ€” A whole apple can't be used by your body directly โ€” digestion breaks it down step by step into nutrients small enough to pass into your blood and reach every part of your body.
12.2

The path food takes

Food travels through a long tube in your body called the digestive tract: it starts at the mouth, goes down the esophagus, into the stomach, then through the small intestine and large intestine, before leftover waste finally leaves the body.

12.3

Each organ's job

1Mouth and esophagus

Teeth chew food into smaller pieces, and saliva starts breaking it down. The esophagus is a muscular tube that pushes the chewed food down to the stomach.

2Stomach

The stomach churns food and mixes it with digestive juices, breaking it down further into a soft, liquid mixture.

3Small and large intestine

The small intestine absorbs most of the nutrients into the blood. The large intestine absorbs water and forms the leftover waste for removal from the body.

Watch out โ€” Digestion isn't just about the stomach โ€” a huge amount of nutrient absorption actually happens in the small intestine, not the stomach itself.
12.4

Keeping digestion healthy

Chewing food well, drinking enough water, and eating a variety of foods with fibre (like fruits and vegetables) all help keep the digestive system working smoothly.

Practice

Exercises

Tap a question to reveal its answer once you've tried it yourself.

Assess

Sample tests

Two 20-mark, 30-minute tests. Reveal answers question by question.