Final answer:
An increase in human blood pressure activates baroreceptors that signal the brain to slow down the heart rate through the baroreceptor reflex, an example of a homeostatic mechanism to manage blood pressure.
Step-by-step explanation:
When human blood pressure (BP) increases, signals are sent to the brain to trigger a response that slows down the heart, helping BP return to a normal level. This is an example of a homeostatic mechanism at work, specifically involving the baroreceptors. The baroreceptors, located in the arch of the aorta and the carotid arteries in the neck, detect changes in blood pressure. When blood pressure rises, the increased rate of baroreceptor firing signals the brain to enact the baroreceptor reflex, which in turn decreases the heart rate through the parasympathetic nervous system and can also reduce the strength of heart contractions. This decrease in heart rate and contraction strength helps in lowering the raised blood pressure back towards a normal range.