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  1. Hormones: What They Are, Function & Types - Cleveland Clinic

    What are hormones? Hormones are chemicals that coordinate different functions in your body by carrying messages through your blood to your organs, skin, muscles and other tissues. These …

  2. Hormone - Wikipedia

    Hormones are required for the normal development of animals, plants and fungi. Due to the broad definition of a hormone (as a signaling molecule that exerts its effects far from its site of …

  3. Hormone | Definition, Function, & Types | Britannica

    Dec 26, 2025 · A hormone is an organic substance secreted by plants and animals that functions in the regulation of physiological activities and in maintaining homeostasis. Hormones carry …

  4. Hormones and the Endocrine System - Johns Hopkins Medicine

    The endocrine system uses hormones to control and coordinate your body's internal metabolism (or homeostasis) energy level, reproduction, growth and development, and response to injury, …

  5. What Is a Hormone? - National Institute of General Medical Sciences

    Jul 17, 2024 · Hormones are chemical messengers in the body that glands form and release, or secrete, into the bloodstream, where they travel to various organs and tissues to change …

  6. Hormones | Endocrine Glands | MedlinePlus

    Jun 28, 2025 · Hormones are your body's chemical messengers. They affect many processes including mood. Too much or too little of a certain hormone can have health implications.

  7. Hormones - Definition, Function, Sources, and Regulation

    Oct 21, 2025 · Hormones are signaling molecules secreted by endocrine organs that regulate physiological processes in target cells. They control growth, development, metabolism, …

  8. Health Encyclopedia - University of Rochester Medical Center

    Hormones and Your Endocrine System The endocrine system makes hormones. These are chemicals that control and coordinate many things in your body. This includes your: …

  9. What are Hormones? - News-Medical.net

    Mar 19, 2025 · Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions.

  10. What to know about hormones - UnitedHealthcare

    Hormones are chemicals made by glands in your endocrine system that travel through your bloodstream, delivering important instructions to your organs and tissues.