They are located in large systemic veins and in the walls of the atria of the heart, and pulmonary vasculature.
Type A receptors are activated by wall tension, which occurs via atrial contraction during ventricular diastole.
Type B receptors are activated by wall stretch, which occurs via atrial filling during ventricular systole.
Low pressure baroreceptors have both circulatory and renal effects, which produce changes in hormone secretion.
These cardiopulmonary receptors also inhibits vagal stimulation in the vasoconstrictor center of the medulla resulting in decreased release of angiotensin, aldosterone, and vasopressin.