Interaction

interaction

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Interaction Senses allow us to observe and understand the world around us. There are five main ways we can do this: through sight (with our eyes), touch (with our skin), smell (with our nose), taste (with our tongue) and hearing (with our ears).

Sight

Hearing

Smell

Taste

Touch

Smell

Touch

The sight: eye

• The iris is a muscle with an opening in the middle.
• The pupil is the opening in the middle of the iris.
• The retina receives images and converts them into signals. It sends the signals to the brain via the optic nerve.
• The eyebrows, eyelids and eyelashes protect our eyes.

Glossary

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hearing

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The hearing

• The outer ear contains the opening to the ear canal. Vibrations enter the outer ear and travel through the ear canal.
• The middle ear contains the eardrum and three small bones. The vibrations from the ear canal pass through the middle ear before reaching the inner ear.
• The inner ear contains the cochlea. This receives vibrations from the three small bones and converts the vibrations into signals.The signals are sent to the brain via the auditory nerve.

TOUCH

Glossary

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• When we touch something, the nerve endings in our skin detect the texture of a surface and the temperature.The nerve endings in our skin send signals to our brain.

The touch

Glossary

Skin

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Nerve endings

You are going to close your eyes. Guess what you are touching!

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Smell

The taste

The smell

• When we inhale through the nostrils, the mucous membrane in the nose detects substances in the air. The mucous membrane sends signals to the brain via the olfactory nerve.

• When we eat or drink, the taste buds on the tongue detect substances in the food or drink.The taste buds send signals to the brain via the gustatory nerve.The brain interprets these signals as tastes.The four main tastes are: salty, sweet, bitter and sour.

Glossary

Glossary