PHYSEDU 203 Lecture Notes - Lecture 3: Portal Vein, Lymphatic System, Gastrointestinal Tract
22 Sep 2016
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Why do we sant to eat: foods have differing effects on our feeling of hunger and satiety. Carbohydrates have a lower satiety value than fats. Bulky foods provide a sense of satiety. Solid foods are more filling than semi-solid foods of liquids. Organization of the body: carbohydrates, proteins, fats, and vitamins are usually very large molecules, the goals of digestion. Break these large molecules down to smaller molecules. Absorb the smaller molecules into the cells of the body: atoms: the smallest units of matter. Atoms bond to each other to form molecules: molecules: Groups of atoms bonded in specific configurations: molecules are the building blocks of the cells, cell-membrane: outer layer enclosing each cell of the body. Long lipid tails face each other toward the interior of the membrane. Phosphate heads" line the interior and exterior surfaces of the membrane.
