SMELL TASTE & TOUCH

1. SMELL TASTE & TOUCH

2. SMELL - NOSE INVESTIGATE THE SMELL A B C D E LEMON JUICE VANILLA ESSENCE VINEGER NAIL POLISH REMOVER WATER

4. SMELL - NOSE • Inside nose – small hair – known as Cilia • Cilia captures odour molecules • There are tiny nerves inside nose – olfactory nerve • Humans have 20million olfactory Nerve in each nostril • Each nerve in nose recognizes different smell • Nerves send signal about the smell to the brain so that one can recognize smell • Human brain recognizes about 10,000 different smell • Anosmia – disease when one cannot smell

5. TASTE - TOUNGE • Surface of the tongue is covered with thousands of bumps, called papillae • Between these bumps are taste buds • Saliva 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

6. 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

7. TOUCH - SKIN

8. TOUCH - SKIN • Skin is a organ • contains millions of nerve endings that send information about touch, pain, pressure and temperature to the brain • Top layer – dead skin • Under dead skin layer is living layer of skin which contains receptors for touch, pain & temperature • Sebaceous glands - produce oil – keeps skin soft and stops it from cracking • Sweat glands - produce sweat • There are: • more touch receptors on your face, tongue, lips, fingertips and toes • about four times more heat receptors than cold receptors • pain receptors all over your skin which can experience fast, burning pain and slow, aching pain.