The human digestive system | Science | Quizalize & Oak National Academy

Starter quiz

What do humans need to stay healthy?

food ✓

water ✓

televison

exercise ✓

sleep ✓
Most humans are omnivores. We eat a varied ______ to stay healthy.

'diet' ✓
What do humans have in their mouth that helps them to bite and chew food?

'teeth' ✓
Match the teeth to their function.

molars

⇔

grind and chew ✓

incisors

⇔

cut and bite ✓

canines

⇔

rip and tear ✓
Our lips, ______ and teeth help us to speak clearly.

'tongue' ✓
The teeth are part of which system in the body?

respiratory system

digestive system ✓

muscular system

Exit quiz

Humans need ______ and water to survive and stay healthy.

'food' ✓
Match the part of the mouth to its function in the digestion process.

teeth

⇔

chop the food into smaller pieces ✓

tongue

⇔

moves food around your mouth ✓

saliva

⇔

moistens the food to make it easier to swallow ✓
What happens to the food after it leaves the mouth?

It is pushed through the throat into your lungs.

It is pushed down the oesophagus into your legs when you stand up.

It falls through the oesophagus into your stomach when you move.

it is pushed through the oesophagus into your stomach by muscles ✓
Which of these statements explains what happens in the next step of digestion?

The stomach wall absorbs all of the food.

Food is digested in the stomach where it disappears.

Stomach acid helps to break down food. ✓

Stomach acid melts all of the food.

Food is mashed up in the stomach by vinegar.
Put these parts of the body in the correct order of digestion, starting with the first part of the digestive system.

1

⇔

mouth

2

⇔

oesophagus

3

⇔

stomach
______ can be used to demonstrate and explain things that we are not able to see or experience for ourselves.

'Models' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

Humans need food and water to survive and stay healthy.
At the start of the digestive system, the tongue moves food around, teeth chop it and saliva makes it easier to swallow.
Food is pushed down the oesophagus into the stomach where stomach acid helps to break down food.
Models can be used to demonstrate and explain things that we are not able to see or experience for ourselves.

Common misconception

Pupils may not realise that there is a continuous system from mouth to anus which is part of a digestive system for food. Also that food goes to the tummy rather than the stomach.

When the pupils sketch the digestive system within the body outline, check the different parts join up to each other so food can pass all the way through. The word tummy is used early on in the slide deck to highlight common misconceptions.

Keywords

Digestive system - The digestive system breaks down food into small particles, which are absorbed into the blood.
Digestion - Digestion occurs when food is broken down so that nutrients can be absorbed by the body.
Saliva - Saliva is a watery liquid in the mouth that keeps it wet and helps prepare food for digestion.
Oesophagus - The oesophagus is the tube in the body that takes food from the mouth to the stomach.
Stomach acid - Stomach acid is a digestive fluid, formed within the stomach lining, that helps digest food.