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 out their …

Hormone producing cells are found in the endocrine glands, such as the thyroid gland, ovaries, and testes. [10] Hormonal signaling involves the following steps: [11] Biosynthesis of a particular …

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.

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

Starling’s original definition of a hormone from 1905 was “a hormone is a substance produced by glands with internal secretion, which serve to carry signals through the blood to target organs”. Today, this …

What is a hormone? A hormone is a chemical that is made by specialist cells, usually within an endocrine gland, and it is released into the bloodstream to send a message to another part of the …

Hormones are a class of signaling molecules that exist in all multi-cell organisms and, in humans, include commonly-known examples like melatonin, testosterone, and cortisol. They influence the ...

Dec 14, 2025 · hormone (plural hormones) (physiology) Any substance produced by one tissue and conveyed by the bloodstream to another to effect physiological activity. quotations

Oct 20, 2025 · When you think of sex hormones, arousal probably comes to mind first. This article explains the multiple functions of sex hormones in both men and women.

HORMONE definition: any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues when …