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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/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/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 adjust his diet, and balance his

www.reference.com/article/speed-up-metabolism-b221646915db8b89

Activities that can speed up metabolism include adding muscle mass; eating regular meals that include protein; drinking coffee, green tea and cold water; and eating organic produce. Some activities to avoid include having more than two alcoholic drinks per day and skipping sleep or meals.

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/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/article/interesting-drug-testing-ff2183c8d62d45ab

One of the most interesting facts about drug testing is that detection times vary depending on the type of drug. Some drugs, such as cannabinoids from marijuana, are detectable up to 60 days, while others, such as amphetamines, become undetectable in a matter of days.

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/far-back-hair-drug-test-296fe53ec9d1f2e9

A hair drug test goes back as far as three months because testing uses about 1 1/2 inches of hair, according to the Drug Testing Network. However, after using a drug, the hair containing the drug evidence does not grow out of the scalp for at least a week.