Digestion and nutrition

Digestion and nutrition - can eat be broken down by humans)...

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Digestion and nutrition Why do we eat? Energy – ability to do work o Thermodynamics [ biological work and laws of thermodynamics pp121-122] o Energy yield: which provides most energy/gram? Lipids 9 kCal Proteins: 4 kCal Carbs: 4kCal o Biosynthesis – need to make biological structures Carbohydrates Protines Lipids What do we eat? Macromolucules: carbs, lipids, proteins o Carbohydrates (extra glucose stored as glycogen in liver and muscles) Monosaccharide(glucose) Disaccharides (sucrose) Polysaccharides (glycogen) Cellulose(insoluble) – fibrous material produced by plants which
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Unformatted text preview: can eat be broken down by humans) o Lipids Fats and oils [know lipids pp 51-53] Triacylglycerol + 3 fatty acids with ester linkage Fats saturated fatty acids; solid at room temp no double/triple bond between c molecules o Allows van der waals interactions; from animals generally Oils unsaturated fatty acids; liquid at room temperature; double/triple bonds between carbons o Limited van der waals interactions o Generally from plants o...
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