ETS Psychology Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The endocrine system plays a crucial role in the body primarily through communication using chemical messengers, known as hormones. These hormones are secreted by various glands (such as the pituitary, thyroid, adrenal, and pancreas) into the bloodstream, allowing them to travel to target organs and tissues throughout the body. This system helps regulate a wide array of physiological processes, including metabolism, growth and development, tissue function, sleep, and mood regulation, among others.

This mechanism of chemical signaling is distinct from other communication systems in the body, such as the nervous system, which primarily uses electrical impulses and neurotransmitters for rapid communication. While the endocrine system can influence processes such as motor activity, controlling body temperature, or processing sensory information, its fundamental function is centered on hormone-based communication that coordinates longer-term changes in the body’s activities.