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Physiology
The pineal gland produces melatonin in response to light exposure, helping to regulate circadian rhythms and sleep-wake cycles.
Pharmacology
Bio-availability of all proton pump inhibitors is reduced by food; they should be taken in empty stomach, followed 1 hour later by a meal to activate H+K+ ATPase and make it more susceptible to the proton pump inhibitor.
General Microbiology
Exotoxins are produced and secreted by bacteria into the surrounding environment. They are typically proteins that can cause damage to the host by disrupting cellular processes. This active secretion distinguishes them from endotoxins, which are part