What characterizes the endocrine mechanism of hormone secretion?

The characteristic that defines the endocrine mechanism of hormone secretion is the secretion of hormones into the bloodstream by endocrine glands. In this process, specialized glands release hormones directly into the circulatory system, allowing these hormones to travel to distant target organs or tissues throughout the body and exert their physiological effects. This systemic approach allows for widespread regulation and coordination of bodily functions, such as metabolism, growth, and the stress response.

The key aspect of this mechanism is that the hormones enter the bloodstream, distinguishing it from paracrine or autocrine signaling, where hormone actions are limited to nearby cells or the cells that secrete them. By understanding this distinction, students can better appreciate how endocrine glands play a crucial role in maintaining homeostasis and integrating various body functions through hormonal communication.