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www.reference.com/article/first-pass-metabolism-688dff37416b672c

Drugs.com defines first-pass metabolism as the intestinal and hepatic degradation or alteration of a drug or substance taken by mouth after absorption that removes some of the active substance from the blood before the substance enters the general circulation. The National Institute of Alcohol Abuse

www.reference.com/article/metabolism-mean-ddb492db7b48cf28

According to the Merriam-Webster dictionary, "metabolism" is defined as the chemical process a plant or an animal uses to create energy needed for survival. Metabolism is responsible for everything from digestion to breathing and muscle movement.

www.reference.com/article/good-metabolic-rate-56372e7c4b841b9e

A good metabolic rate balances the intake of diet by an individual with his total daily energy expenditure. The TDEE, or maintenance level, represents normal daily activities and physical exercise. The maintenance level and basal metabolic rate helps an individual to adjust his diet, and balance his

www.reference.com/article/cell-metabolism-6602b81ad2920de4

Cell metabolism involves several complex biochemical reactions that occur in living organisms to maintain a normal life. These metabolic pathways are broadly classified as anabolism and catabolism.

www.reference.com/article/metabolic-wastes-6593209d775f5df1

Metabolic wastes, also known as excretes, are substances produced by the metabolic activities of living organisms. These substances cannot be used by the organism and are therefore excreted. These excretes include carbon dioxide, nitrogen compounds, sulfates, phosphates and water.

www.reference.com/article/foods-speed-up-metabolism-7c5d14c8b0f57c26

Foods that speed up metabolism include spicy foods and protein-rich foods, according to WebMD. Other foods that speed up metabolism are whole grains, cruciferous vegetables and berries, states the Huffington Post.

www.reference.com/article/end-product-protein-metabolism-5819ae087e8e097a

The end product of protein metabolism is typically nitrogenous waste in the form of ammonia, urea or uric acid. If it is not properly excreted from the body, these substances may build up in the body's systems and result in health issues.

www.reference.com/article/metabolic-disorder-fd42a030cbecc601

A metabolic disorder is when abnormal chemical reactions in the body disturb the metabolic process, states MedlinePlus. The metabolic process, or metabolism, is the process by which the body converts food into energy, states Healthline. The body breaks down nutrients in food using enzymes and then t

www.reference.com/world-view/first-class-second-class-proteins-3665ee504df2ba55

First-class proteins are proteins found from animals, and second-class proteins are proteins found from plants. First-class proteins come from meat, eggs, fish and dairy products while non-animal related foods, like vegetables and fruits, provide second-class proteins.

www.healthline.com/nutrition/get-a-fast-metabolism

Metabolic rates vary by individual. This article explains why some people have a fast metabolism and how you can speed up yours to burn more calories. Your metabolism is the chemical engine that keeps you alive. The speed at which it runs varies by individual. Those with slow metabolism tend to have