Tachycardia is caused by hypoxia due to
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.
Reflexly through peripheral chemoreceptors
Diffuse vasodilation
Through central chemoreceptor
Secondarily after by hyperventilation