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Using positron emission tomography, researchers discovered that both the injection of a placebo solution and the injection of an actual opioid painkiller activated the same brain area, called the anterior cingulate cortex, which is known to contain opioid receptors.
Tidal Volume
The volume of air inhaled or exhaled in a normal breath at rest.
Bicarbonate
A buffer component that regulates acid-base balance in the body, especially important in the bloodstream and digestive system.
Carbon Dioxide
An invisible, scentless gas generated from the combustion of carbon and organic substances, as well as through the process of breathing. It exists naturally in the atmosphere and is taken in by plants during the process of photosynthesis.
Lactic Acid
A chemical byproduct of anaerobic respiration, mostly known for causing muscle fatigue and soreness during intense physical activity.
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