When there is a drop in blood pressure, the body reacts immediately by way of the ________.

A) baroreceptor mechanism
B) chemoreceptor mechanism
C) CNS ischemic mechanism
D) stress-relaxation mechanism
E) adrenal medullary mechanism

Baroreceptor Mechanism

A reflex mechanism using sensory receptors in the blood vessels to detect changes in blood pressure and stimulate responses to maintain homeostasis.

Chemoreceptor Mechanism

A physiological process involving receptors that detect changes in the chemical concentration of substances (such as oxygen or carbon dioxide) in the body and signal these changes to the nervous system.