<prompt> Tachycardia is caused by hypoxia due toReflexly through peripheral chemoreceptorsDiffuse vasodilationThrough central chemoreceptorSecondarily after by hyperventilation  <response>: Tachycardia and vasodilation occur secondary to hyperventilation in cases of hypoxia. Central chemoreceptors do not have a role in hypoxia. Activation of peripheral chemoreceptors excites medullary vagal centre and causes Bradycardia. 