answers: the pH of their environment
context: total peripheral resistance. Baroreceptors act immediately as part of a negative feedback system called the baroreflex, as soon as there is a change from the usual mean arterial blood pressure, returning the pressure toward a normal level. These reflexes help regulate short-term blood pressure. The solitary nucleus in the medulla oblongata of the brain recognizes changes in the firing rate of action potentials from the baroreceptors, and influences cardiac output and systemic vascular resistance. Baroreceptors can be divided into two categories based on the type of blood vessel in which they are located: high-pressure arterial baroreceptors and low-pressure baroreceptors (also </s> the auditory cortex contribute to sound localization, investigators implanted cryoloops to deactivate the 13 known regions of acoustically responsive cortex of the cat. Cats learned to make an orienting response by moving their heads and approaching a 100-ms broad-band noise stimulus emitted from a central speaker or one of 12 peripheral speakers located at 15° intervals from left 90° to right 90°along the horizontal plane after attending to a central visual stimulus generated by a red LED. After the cats had reached at least 80% accuracy in identifying the location of the sound stimulus, each was implanted with one or </s> Central chemoreceptors Central chemoreceptors of the central nervous system, located on the ventrolateral medullary surface in the vicinity of the exit of the 9th and 10th cranial nerves, are sensitive to the pH of their environment. These act to detect the changes in pH of nearby cerebrospinal fluid (CSF) that are indicative of altered oxygen or carbon dioxide concentrations available to brain tissues. An increase in carbon dioxide causes tension of the arteries, often resulting from decreased CO output (hypercapnia), indirectly causes the blood to become more acidic; the cerebrospinal fluid pH is closely comparable to plasma, as carbon dioxide
question: the ventilatory central chemoreceptors respond to changes in the