A baroreceptor is a specialized sensory nerve ending that detects changes in blood pressure. These receptors are primarily located in the walls of large blood vessels, such as the carotid arteries and the aorta. When blood pressure rises or falls, baroreceptors send signals to the brain, helping to regulate cardiovascular function. The information from baroreceptors plays a crucial role in maintaining homeostasis. When blood pressure increases, baroreceptors trigger responses that lower heart rate and dilate blood vessels. Conversely, if blood pressure drops, they stimulate mechanisms to raise it, ensuring that vital organs receive adequate blood flow.