The three functions of the thyroid gland are: regulate growth produce insulin control bladder regulate bone calcium control metabolism produce adrenaline its multiple answers

regulate growth

produce insulin

control bladder

regulate bone calcium

control metabolism

produce adrenaline

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.