Final answer:
Examples of endogenous substances produced by the body include catecholamines and steroid hormones like cortisol and aldosterone.
Step-by-step explanation:
Examples of endogenous substances produced by the body include catecholamines and steroid hormones like cortisol and aldosterone.
Catecholamines, such as epinephrine, norepinephrine, and dopamine, are synthesized from the amino acid tyrosine and are secreted by the adrenal medulla. They play a role in the fight-or-flight response.
Steroid hormones, like cortisol and aldosterone, are derived from cholesterol. They are released by the adrenal glands and are involved in regulating metabolism, the immune response, and electrolyte balance.