Digestion- foundation level

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Small intestine (5 metres long!!)

Amylase, Protease and Lipase Enzymes

Absorption

Large intestine

egestion

Slide 11

Tour guide

Mouth

Teeth

Amylase enzyme (What are enzymes???)

Oesophagus

peristalsis

Stomach

Protease enzyme

Enzymes and pH

Pancreas

Amylase, Protease and Lipase Enzymes

Small intestine

Amylase, Protease and Lipase Enzymes

Absorption

Large intestine

egestion

Slide 12

Teeth

Teeth are needed to tear, rip and chew food to physically break it into smaller pieces.

Let’s look at the internal structure of teeth. You will need to cut up a copy of Worksheet 1 now.

Slide 13

Teeth

The crown is the part of the tooth above the gum line

The root is the part of the tooth below the gum line

The enamel is the white part you can see covering the crown.

Enamel is the hardest substance in the human body

It covers the dentine and stops bacteria getting inside the tooth

Slide 14

Teeth

The crown is the part of the tooth above the gum line

The root is the part of the tooth below the gum line

The dentine is the major component within the tooth.

It is made from softer material than enamel so is easier to decay.

Slide 15

Teeth

The crown is the part of the tooth above the gum line

The root is the part of the tooth below the gum line

The pulp contains the nerves and blood vessels of the tooth.

It is underneath the dentine.

This is the bit which hurts when you have toothache!

Slide 16

Teeth

The crown is the part of the tooth above the gum line

The root is the part of the tooth below the gum line

The cementum is found outside the dentine in the root.

It cements (holds) the tooth into the jaw bone.

Slide 17

Types of teeth

There are different types of teeth for different functions:

Cutting and chopping food

Sharp pointed teeth for cutting and tearing food

Crushing and grinding food

Grinding and mashing food

Slide 18

Experiment

Get a mirror and look at your own teeth.

Can you identify your incisors, canines, pre molars and molars?

Slide 19