There are essential conditionally essential and non

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Unformatted text preview: e body. there are essential, conditionally essential and non- essential nutrient chemicals in food if we are deficient in essential nutrient in the body- we have nutritional deficiency disease 3 The Cephalic Phase of Digestion and Absorption: Chemical and mechanical digestion begins in the mouth Chewing: mastication all senses involved in preparation to eat Salivary secretion is under autonomic control (stim by SNS and PNS) softens and lubricates food and provides enzymes: amylase and some lipase 4 Brain imagining: large areas of the brain light up when we prepare to eat 2 02/03/2012 The tongue contains “taste buds” or papillae that are able to detect bitter, sweet, salty, sour and savory. Contrary to popular belief there is no regional segregation for these flavours (tongue map). Together with receptors in the nasal cavity the tongue transmits ‘flavour and smell information” to the CNS • stimulate salivary glands to begin digestion taste taste standard chemical sweet -----------------sucrose 5 sour--------------------HCl salty--------------------NaCl bitter------------------Quinine salvary/umami-------L-theanine (proteins etc) warm milk and green tea has this taste ‘Tasting’ nutrients on the tongue and ‘tasting/sensing’ nu...
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