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# Hormonal System The document describes the hormonal system, including its function, mechanisms, and components. **Function:** * Regulation of bodily functions (growth, reproduction, metabolism). * Hormones are produced in specific cells and stored in other organs or glands. * Endocrine sy...

# Hormonal System The document describes the hormonal system, including its function, mechanisms, and components. **Function:** * Regulation of bodily functions (growth, reproduction, metabolism). * Hormones are produced in specific cells and stored in other organs or glands. * Endocrine system releases hormones into the bloodstream, that are distributed throughout the body. **Mechanism of Action:** * Extremely low concentrations of hormones are sufficient to achieve effects at target cells. * Hormones circulate in the blood and only interact with cells having specific receptors (binding sites). * The effect occurs via a key-lock principle, where hormones bind to specific receptors on target cells. * The hormonal system involves an interconnected network of glands that regulate each other. **Duration of Action:** * The effect duration depends on hormone breakdown. * A continuous supply of hormones ensures that their effect is regulated effectively. * Some actions are slower than the neural signal transmission. * Some effects can last from minutes to hours or even months/years. * Positive feedback loops increase hormone production. * Negative feedback loops decrease hormone production. **Components of the Hormonal System:** The document provides a list of the major glands in the hormonal system: * Hypothalamus * Hypophysis * Thyroid gland * Adrenal glands * Pineal gland * Parathyroid glands * Thymus gland * Pancreas * Ovaries