physiology
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WHAT IS MEANT BY THE BARORECEPTOR REFLEX?EXPLAIN HOW IT CONTRIBUTES TO HOMEOSTATIC CONTROL OF THE CARDIOVASCULAR SYSTEM.
The baroreceptor reflex is the bodys rapid response system for dealing with changes in blood pressure.Baroreceptor reflex actually works day by day,minute by minute,second to second,to make sure that blood flow to the brain and the pressure of blood reaching the brain are kept within homeostatic limits.
The components of the baroreceptor reflex consist of baroreceptors, sensory nerve fibres,cells in the central nervous system,efferent automatic nerves,and the cardiac and smooth muscle cells on which the autonomic nerves act to alter cardiac contractibilty,heart rate, and peripheral resistance.
The reflex involves nerve endings in the blood vessels for the neck and thorax.When stretched by increased arterial pressure ,these nerves are excited and send signals to the brain.The appropriate brain centres respond by slowing the heart and by promoting vasodilation.There are two concentrations of baroreceptors (pressure sensors) in humans.The first is on carotid sinus at the bifurcation of the internal and common carotid artery...