Final answer:
The endocrine system releases corticosteroids and catecholamines into the bloodstream, preparing the body for the fight-or-flight response during stress.
Step-by-step explanation:
The system that releases corticosteroids and catecholamines through glands into the bloodstream is the endocrine system. The specific glands responsible for releasing these hormones are the adrenal glands.
When a person experiences stress, the sympathetic nervous system triggers the release of adrenaline from the adrenal glands, which is a catecholamine. The adrenal glands also release cortisol, which is a corticosteroid, into the bloodstream.
These hormones help prepare the body for the fight-or-flight response by increasing heart rate, respiration, and providing a boost of energy.