<prompt> Stimulation of peripheral chemoreceptors causes:BradycardiaTachycardiaEither bradycardia or tachycardiaNeither bradycardia nor tachycardia  <response>: Peripheral chemoreceptor in the carotid and aoic bodies can produce variable effects on hea rate- Direct Effect: Vagal stimulation- Bradycardia Indirect effect : Hypoxia- Peripheral chemoreceptor stimulation - Hyperventilation and increased catecholamine secretion - Tachycardia and increased cardiac output Chemoreceptor reflex Receptors Peripheral chemoreceptors in carotid and aoic bodies Central chemoreceptors in the medulla. Stimulus Decrease in PaO2 Increase in Pa CO2, H ion conc Afferent IX sinus nerve of Hering and X Vagus N Center for Reflex Medulla Efferent Sympathetic and parasympathetic neurons to hea vasculature and adrenal medulla. Response Direct effect: Bradycardia Indirect effect: Hyperventilation , tachycardia, vasoconstriction, increased cardiac output and increased BP. Ref: Ganong; s Review of Medical Physiology 26th edition Pgno: 581, 582 