Yes, theyare theones to release adrenaline, when needed. We all know that adrenaline raises our stress level, and that boosts our short term memory, pain bearing ability, reflexes, analytical skills for a short while
Electrical impulses to instruct to prepare the tissue to met out emergency situation of emotional stress would be limited. For this, chemical signals are also required to reach all cells of the body and provide the wide ranging changes needed. This is done by adrenaline hormone secreted from the adrenal glands.
Adrenal is secreted directly into the blood and carried to different parts of the body.