SMELL TASTE & TOUCH

SMELL - NOSE

INVESTIGATE THE SMELL

A B C D

LEMON JUICE

VANILLAESSENCE

VINEGER NAIL POLISH

REMOVER

E

WATER

Inside nose – small hair – known as CiliaCilia captures odour moleculesThere are tiny nerves inside nose – olfactory nerveHumans have 20million olfactory Nerve in each

nostrilEach nerve in nose recognizes different smellNerves send signal about the smell to the brain so

that one can recognize smellHuman brain recognizes about 10,000 different

smellAnosmia – disease when one cannot smell

SMELL - NOSE

Surface of the tongue is covered with thousands of bumps, called papillae

Between these bumps are taste budsSaliva in our mouths must first dissolve

samples of food so that the taste buds can detect them and send messages to the brain.

Senses of smell and taste work together to detect flavour

TASTE - TOUNGE

TASTE REGIONS

Moist the cotton bud in each solution and touch each region of the Tongue

Some parts of your tongue are more sensitive to certain tastes

TOUCH - SKIN

TOUCH - SKIN

Skin is a organcontains millions of nerve endings that send information

about touch, pain, pressure and temperature to the brainTop layer – dead skinUnder dead skin layer is living layer of skin which

contains receptors for touch, pain & temperatureSebaceous glands - produce oil – keeps skin soft and

stops it from crackingSweat glands - produce sweatThere are:

more touch receptors on your face, tongue, lips, fingertips and toes

about four times more heat receptors than cold receptorspain receptors all over your skin which can experience fast,

burning pain and slow, aching pain.