The Biology of Tasting (AQA GCSE Food Preparation & Nutrition)
Revision Note
Written by: Ruth Brindle
Reviewed by: Lára Marie McIvor
Taste receptors & olfactory systems
The flavours that we experience in foods are a result of both our taste receptors and our olfactory receptors in the nose working together
The feeling of the food in our mouths also contributes towards the flavours that we experience
Receptors on the tongue
Taste receptors are found on the surface of the tongue
These receptors can detect:
sweet
salty
sour
bitter
umami is a fifth taste that has been recently added, it senses a savoury meaty flavour in food
In the mouth, food dissolves in saliva and enters the receptors
Tiny hairs inside the receptors send signals to the brain to indicate the specific taste that has been encountered
Tongue map diagram
Receptors in the nose
Olfactory receptors are found in the nose
They are responsible for the identification of smells and aromas
Gases produced by food are passed across the receptors in the epithelial cells in the nose
Receptors pass signals to the brain to indicate the type of smell encountered
Olfactory system diagram
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