Starter… Complete the exam question on teeth Then……

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Presentation transcript:

Starter… Complete the exam question on teeth Then…… Use the following words to describe the role of the mouth in INGESTION: Teeth Molars Incisors Canines Pre-molars Salivary glands Saliva Mastication / masticate Bolus Oesophagus Peristalsis

23rd January 2012 Digestion and it’s organs Describe what the term ‘digestion’ means (C) State and describe the role of the digestive organs (B)

Ask pupils to look at digestive organs Which extra organs are on there that have not been talked about yet? Liver Pancreas Gall bladder

Food contains nutrients.

To get these nutrients into our bodies, large molecules need to be broken down.

First, food is chewed in the mouth.

The teeth break the food into smaller lumps.

The food is mixed with saliva.

Saliva contains enzymes to start breaking down chemicals in the food.

The food is then swallowed.

Muscles in the oesophagus push the food towards the stomach.

Muscles in the oesophagus push the food towards the stomach.

Muscles in the oesophagus push the food towards the stomach.

In the stomach the food is mixed with acid and more enzymes.

The food stays in the stomach for a few hours and becomes a runny liquid.

The liquid then travels into the small intestine.

match up..... HEADS TAILS Digestion starts in the ... ...oesophagus, using a muscle movement called peristalsis. Saliva contains special chemicals... .... mouth, where teeth grind up food into small pieces. Food then passes down the ... .....enzymes are added to break down the food even further. In the stomach...... ...to speed up the start of digestion. Gastric juices and more chemicals called... ...food is churned to break it down even further.