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The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.
The human gastrointestinal tract consists of the esophagus, stomach, and intestines, and is divided into the upper and lower gastrointestinal tracts. [3] The GI tract includes all structures between the mouth and the anus , [ 4 ] forming a continuous passageway that includes the main organs of digestion, namely, the stomach , small intestine ...
Metabolism (/ m ə ˈ t æ b ə l ɪ z ə m /, from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical reactions in organisms.The three main functions of metabolism are: the conversion of the energy in food to energy available to run cellular processes; the conversion of food to building blocks of proteins, lipids, nucleic acids, and some carbohydrates; and the ...
Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.
Meat production and trade substantially increase risks for infectious diseases , including of pandemics, whether though contact with wild and farmed animals, or via husbandry's environmental impact. [97] [98] For example, avian influenza from poultry meat production is a threat to human health. [99]
Meat is an important and highly preferred human food. [2] Individuals' attitudes towards meat are of interest to consumer psychologists, to the meat industry, and to advocates of reduced meat consumption. [11] [12] [13] These attitudes can be affected by issues of price, health, taste, and ethics.
Spoiled meat changes color and exudes a foul odor. Ingestion can cause serious food poisoning. Salt-curing processes were developed in antiquity [9] in order to ensure food safety without relying on then unknown anti-bacterial agents. The short shelf life of fresh meat does not pose significant problems when access to it is easy and supply is ...
Catching Fire: How Cooking Made Us Human is a 2009 book by British primatologist Richard Wrangham, published by Profile Books in England, and Basic Books in the US. It argues the hypothesis that cooking food was an essential element in the physiological evolution of human beings. It was shortlisted for the 2010 Samuel Johnson Prize.