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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 Natio...

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/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/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 ad...

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...

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...

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.