Digestive System KS2

Facts, Activities and Ready-to-Teach Lessons

Teaching the digestive system KS2 topic is a fantastic way to help children understand how their bodies work and how food gives us the energy we need to grow, move and stay healthy.

Whether you're introducing the main organs of the digestive system, exploring the journey food takes through the body, or teaching the role of teeth and nutrition, having engaging and visual resources makes all the difference.

At PlanBee, we’ve created ready-to-teach Science lessons to help make teaching the digestive system simple, clear and enjoyable for both teachers and pupils.

Digestive System KS2 Lesson Example


What is the Digestive System?

The digestive system is the group of organs in the body that work together to break down food so that nutrients can be absorbed and used for energy, growth and repair.

Children in KS2 learn that digestion starts in the mouth and continues through several different organs before waste leaves the body.

The main parts of the digestive system include:

  • Mouth
  • Teeth
  • Tongue
  • Oesophagus
  • Stomach
  • Small intestine
  • Large intestine
  • Liver
  • Pancreas
  • Rectum
  • Anus

Understanding how these organs work together helps children see how important healthy eating and good dental care really are.

Fascinating facts about the Digestive System to share with your KS2 class:

  1. Stomach acid is strong enough to dissolve metal but our stomach lining protects us from its effects.

  2. The digestive system is over 9 metres long from mouth to anus.

  3. The small intestine isn't actually small at all. It has a surface area the size of a tennis court thanks to all the small folds and villi.

  4. The gurgling sound you hear when you have a hungry, empty tummy is called 'borborygmi' and is caused by gas and food moving through the digestive tract

  5. Your gut is sometimes called the "second brain" because it contains millions of neurons and can influence mood and stress levels.

  6. The liver is the only organ in the body that can regenerate if a part of it is removed.

  7. Much like fingerprints, each person’s gut bacteria community is unique, influencing digestion, immune response, and even mood.

Digestive System KS2 Objectives

The digestive system is taught as part of the Year 4 Science curriculum in England under the topic of Animals, Including Humans.

Pupils are expected to:

  • describe the simple functions of the basic parts of the digestive system in humans
  • identify the different types of teeth in humans and their simple functions
  • construct and interpret a variety of food chains, identifying producers, predators and prey

Although food chains are taught within the same unit, understanding digestion helps children make important links between nutrition, food and survival.

How to Teach the Digestive System in KS2

Children often learn best when this topic is made practical and visual.

Popular classroom activities include:

Digestive System Demonstrations 🥪

Use simple props such as:

  • crackers or bread to show chewing
  • orange juice to represent stomach acid
  • tights or stockings to model intestines
  • mashed banana and biscuits to represent digested food

These hands-on activities help children remember each stage of digestion far more effectively than diagrams alone.

Labelled Diagrams 📝

Asking children to label a digestive system diagram helps reinforce vocabulary and organ order.

Teeth Investigations 🦷

Explore the functions of incisors, canines, premolars and molars by investigating how each tooth helps us eat different foods.

Food Chain Links 🔗

Help pupils connect digestion to survival by showing how energy passes through food chains.

Ready-to-Teach Digestive System KS2 Lessons

If you're looking for complete lessons with no extra planning required, our Animals Including Humans KS2 resources include everything you need.

Our lessons include:

  • detailed lesson plans
  • engaging slideshows
  • differentiated worksheets
  • practical investigations
  • challenge activities
  • assessment opportunities

This helps teachers save valuable planning time while ensuring full curriculum coverage.

Featured Lesson: Digestive System KS2

Our dedicated Digestive System lesson helps children:

  • identify the main organs involved in digestion
  • understand the journey food takes through the body
  • explain the role of each organ
  • apply their knowledge through practical and written activities

Perfect for Year 4 teachers, supply teachers and ECTs who want a ready-made lesson that can be taught with confidence.

👉 Explore the Digestive System KS2 lesson pack

Why Teachers Choose PlanBee

Teachers across the UK use PlanBee because our lessons are:

  • fully planned and ready to teach
  • created for the primary classroom
  • aligned to the National Curriculum
  • designed to save hours of preparation time
  • flexible enough for adaptation to suit your class

Whether you're teaching one lesson or planning an entire Science unit, having resources you can trust makes all the difference.

Frequently Asked Questions

What year group learns the digestive system?

The digestive system is mainly taught in Year 4 as part of Animals Including Humans.

Is the digestive system taught in KS1?

Not in detail. KS1 children learn basic ideas about healthy eating and the human body, but the full digestive system is usually introduced in Lower KS2.

What is the easiest way to explain digestion to children?

A simple explanation is: digestion is how your body turns food into energy by breaking it down into tiny parts your body can use.

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