【填空题】AV Clip 2: The Value of Vitamins
AV 1+2 The Value of Vitamins.mp4 Watch the video clip three times and complete the following passage by filling in each blank with the word from the video clip. For lipid-soluble vitamins, dissolved in fat and found in foods like diary, butter and oils, this trip into the (1) ________ is a little more adventurous. These vitamins make it through the stomach and the (2) _________, where an acidic substance called bile flows in from the liver, breaking up the fat and preparing it for (3) _________ through the intestinal wall. Because fat-soluble vitamins can’t make use of the blood’s (4) ________ nature, they need something else to move them around, and that comes from (5) ________ that attach to the vitamins and act like couriers, transporting fat-solubles into the blood and around the body. So, this difference between water- or fat-soluble vitamins (6) ____________ how they get into the blood, but also how they’re stored or (7) ___________ from the body. The system’s ability to circulate water-soluble vitamins in the bloodstream so easily means that most of them can be passed out equally easily via the (8) _______. Because of that, most water-soluble vitamins need to be replenished on a daily (9) ____________ through the food we eat. But fat-soluble vitamins have (10) __________ power because they can be packed into the liver and in fat cells. The body treats these parts like a pantry, storing the vitamins there and rationing them out when needed, meaning we shouldn’t overload on this type of vitamin because the body is generally well stocked.
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