Lesson: Digestive System. Science Differentiation in action All living things are made up of cells....

Lesson: Digestive System

Science Differentiation in action

All living things are made up of cells.

Food has to be broken down before it is transported to every cell.


Our digestive system breaks down food and absorbs it so it can be transported around our bodies.


mouth

oesophagus

stomachpancreas

small intestinelarge intestine

liver

Parts of our digestive system


mouthwhere food is chewed and mixed with saliva



the tube that carries food to the stomach

oesophagus



stomachstores food and mixes it with digestive juices



small intestinethe tube where broken down food is absorbed into the blood



passes water back into the blood leaving solid waste

large intestine



pancreasmakes digestive enzymes



livermakes bile which helps to break down fats



What is the function of each part?

mouth

oesophagus

stomach

pancreas

small intestinelarge intestine

liver


Nutrition involves 5 stages.

Ingestion

Digestion

Absorption

Assimilation

Egestion


Teeth

break down food into smaller pieces (physical digestion)


There are four types of teeth.

Incisors Canines Premolars Molars

Upper or maxillary teeth

Lower or mandibular teeth


Incisors

Canines

Molars

Premolars


Teeth

Incisors

Canines

Premolars

Molars


Teeth

Incisors – cut food

Canines – tear food

Premolars – grind food

Molars – grind food


Review Questions:Label each part.

E

A

BC

DG

F


Enzymes are involved in chemical digestion.

What do you think this means?

Question to think about

Enzymes act here!

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