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Considering that sounds and odors both trigger changes in the patterns of action potentials from sensory cells, how does the brain perceive which sense is which when the action potentials reach the brain? a. The action potentials stimulated by sounds are different in size and shape from those stimulated by an odor. b. The axons from different sensory neurons go to different areas of the brain. c. Mechanoreception is not consciously perceived by the brain, whereas chemoreception is. d. Chemoreception is not consciously perceived by the brain, whereas mechanoreception is.

Respuesta :

Given that odors and sounds both cause changes in the patterns of action potentials from sensory cells, chemoreception—which is not consciously perceived by the brain—occurs when action potentials reach the brain. Mechanoreception, on the other hand, occurs when action potentials reach the brain. The right option is (d).

Traditionally, a shift in breathing caused by variations in CO2/H+ observed in the brain is referred to as central chemoreception. Since the last Handbook of Physiology was released in 1986, interest in central chemoreception has increased significantly. The ventral medullary surface was initially thought to be the site of central chemoreception, and this theory was supported by the recent discovery of potential chemoreceptor neurons with particular characteristics close to one of these sites.

However, there is strong evidence that many locations, some of which are distant from the ventral medulla, engage in central chemoreception. The sensing of brain interstitial fluid H+ by central chemoreception serves to detect and integrate data on 1) alveolar breathing (arterial PCO2), 2) brain blood flow and metabolism, and 3) brain blood pressure. 3) acid-base balance, which can then have an impact on arousal, blood pressure (sympathetic tone), respiration, airway resistance, and blood pressure.

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