What is a hormone? multiple choice: o a chemical released from a nerve cell that affects nearby cells across a synapse o a chemical released from an endocrine gland that affects target cells without entering the bloodstream o a chemical found in the blood that catalyzes the destruction of ingested toxins and foreign substances o a chemical excreted from sweat gland that signals other individuals about the physiological status of the body o a chemical regulator secreted from an endocrine gland that travels through the bloodstream to affect target cells