• The cardiovascular center receives information about the state of the body through the following sources: • Baroreceptors are sensory neurons that monitor arterial blood pressure. Major baroreceptors are located in the carotid sinus (an enlarged area of the carotid artery just above its separation from the aorta), the aortic arch, and the right atrium. • Chemoreceptors are sensory neurons that monitor levels of CO 2 and O 2 . These neurons alert the cardiovascular center when levels of O 2 drop or levels of CO 2 rise (which result in a drop in pH). Chemoreceptors are found in carotid bodies and aortic bodies located near the carotid sinus and aortic arch. • Higher brain regions, such as the cerebral cortex, hypothalamus, and limbic system, signal the cardiovascular center when conditions (stress, fight-or-flight response, hot or cold temperature) require adjustments to the blood pressure. • The kidneys provide a hormonal mechanism for the regulation of blood pressure by
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