Neural origin of the respiratory-heart rate response

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Abstract
The neural pathways involved in the respiratory-heart rate response (variation in the heart rate occurring simultaneously with respiration) were studied in 26 dogs, 16 cats, and 10 chickens. This study indicated that: the vagi provided afferent pathways for impulses arising from receptors in the lungs or thorax to reach the cardiac regulatory centers; central radiation of impulses from the respiratory centers to the cardiac regulatory centers occurred; and sympathetic outflow to the heart synchronous with respiration was present.