UNIT 1: The

Human Body

PART II: Smell, taste and Touch

SIGHT HEARING SMELL

TOUCHTASTE

SMELL

We smell with our nose

Our noseis the organ we use to

smell

We can smell about 10.000

different odours

How do we smell?

Air enters the nose

through the nostrils

Nostrils1

Nostrils

2 The olfactory nerve sends information to our brain which tells us what we can smell

Nostrils

Nostrils

Olfactory nerve

Nostrils

Brain

Olfactory nerve

TASTE

Our tongue is the

organ we use to taste

Nerves send information about the different

tastes to the brain

Our tongue is covered in taste buds. These identify different tastes.

We can identify 4 tastes:

We can identify 4 tastes:

Bitter

We can identify 4 tastes:

Sour

We can identify 4 tastes:

Salty

We can identify 4 tastes:

Sweet

Which one is salty?

Salty

Which one is sour?

Sour

Which one is bitter?

Bitter

Which one is sweet?

Sweet

TOUCH

Our skinis the organ we use to

touch

Skin tells us if the object feels:

Soft or Hard

Hot or Cold

Rough or

Smooth

Hot Cold

Hard Soft

Smooth

Rough

Sensory nerves send

this information to

the brain

Our skinis like a

wrapper. It keeps out

harmful germs and dirt.

Wrapper

But we not only feel with the hands…

Differences in hair and skin colour are normal and make each of us unique.