Biochemistry - A science that studies the chemistry of living organisms. It includes the chemical processes involved in the maintenance and reproduction of body cells and the chemical reactions carried out inside cells that make up the metabolism of the body.
Overall regulation of these chemical processes is a function of hormones, whereas regulation of individual reactions is carried out by enzymes. A constant interchange occurs between cell fluids and blood and urine. Biochemists can therefore learn about the chemical changes going on inside cells from measurements of the various minerals, gases, enzymes, hormones, and proteins in blood, urine, and other body fluids. Such tests are used to make diagnoses and to screen for a disease and to monitor its progress.
The most common biochemical tests are performed on blood, and they include liver function tests and kidney function tests. Biochemical tests can also be performed on urine (see urinalysis) and other body fluids.
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