Chemoreceptor reflex primarily causes

Peripheral aerial chemoreceptors in the carotid and aoic bodies have very high rates of blood flow. These receptors are primarily activated by a reduction in paial pressure of oxygen (PaO2), but they also respond to an increase in the paial pressure of carbon dioxide (PaCO2) and pH. Chemoreceptors exe their main effects on respiration; however, their activation also leads to vasoconstriction. Central chemoreceptors - rise in blood pressure causes a reflex decrease in hea rate the aerial baroreceptors. This is why bradycardia rather than tachycardia. Ref: Ganong's Review of medical physiology 25th edition. Page: 593