During vigorous exercise, high rates of aerobic respiration produce carbon dioxide, lowering blood pH. Which sequence correctly describes the nervous coordination pathway that restores blood pH to normal?
Chemoreceptors in the carotid arteries detect a decrease in pH →\rightarrow→ increased frequency of impulses via sensory neurones to the medulla oblongata →\rightarrow→ increased frequency of impulses via sympathetic neurones to the sinoatrial node (SAN).
Baroreceptors in the aorta detect a decrease in pH →\rightarrow→ increased frequency of impulses via sensory neurones to the hypothalamus →\rightarrow→ increased frequency of impulses via parasympathetic neurones to the sinoatrial node (SAN).
Chemoreceptors in the carotid arteries detect an increase in pH →\rightarrow→ increased frequency of impulses via motor neurones to the cerebellum →\rightarrow→ decreased frequency of impulses via sympathetic neurones to the atrioventricular node (AVN).
Baroreceptors in the aorta detect a decrease in pressure →\rightarrow→ increased frequency of impulses via sensory neurones to the medulla oblongata →\rightarrow→ increased frequency of impulses via parasympathetic neurones to the sinoatrial node (SAN).