Shortterm regulation

Baroreceptors comprise a negative feedback system incorporating stretch receptors sensitive to both mean pressure and rate of change of pressure a (elevations in blood pressure increase the rate of firing). Under physiological r

0 conditions, baroreceptor firing exerts a tonic inhibitory influence on the s sympathetic outflow from the medulla oblongata. High-pressure barorecep-

1 tors are found in the carotid sinus, at the bifurcation of the common carotid

y artery and in the aortic sinus in the arch of the aorta.

e Hypothalamus.

Arterial chemoreceptors. Vomiting centre. Pulmonary stretch receptors. Ventricular mechanoreceptors. Atrial stretch receptors.

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