pelajaran = [ kata dasar / root word: ajar ] lesson, study, essay, treatise, exercise, course
(kata umum, a common word)

mengikuti pelajaran = attend classes
(kata umum - a common word)

pelajaran kilat = course; training
(kata umum, common word)

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Receptors on these cells detect when they have produced too much serotonin and shut off production in the same way a thermostat shuts off the furnace when the air reaches the right temperature.