The endocrine system

The endocrine system is one of the body’s main regulatory systems: through hormones, it controls the work of cells, tissues and organs.

What hormones are

Hormones are biologically active chemical substances that act as messengers in the body. They are produced by specialized cells and endocrine glands and travel through the blood or lymph to reach their target cells.

To date, more than 150 hormones have been described. The balance between them forms the hormonal profile, which determines the body’s stability and its ability to adapt.

The role of the endocrine system

Hormones directly or indirectly govern:

metabolism
growth and development
sexual function
nervous system function
mood
memory and cognitive function
the immune response

Disruption of endocrine function can lead to serious metabolic, neurological and hormonal disorders.

General overview of the endocrine system

The endocrine system is a network of endocrine glands and specialized hormone-producing cells. Its key features are:

endocrine glands have no ducts
the hormones they produce pass directly into the blood and lymph
hormones act only on cells that carry the corresponding receptor

Central organs of the endocrine system

The central level of endocrine regulation consists of:

The neurosecretory nuclei of the hypothalamus – link the nervous and endocrine systems
The pituitary gland – the “master gland” that controls the other endocrine glands
The pineal gland (epiphysis) – involved in regulating biorhythms and the sleep–wake cycle

Peripheral organs of the endocrine system

🔹 a) Pituitary-dependent glands

Thyroid gland
Adrenal cortex
Endocrine cells of the gonads (testes and ovaries)

🔹 b) Pituitary-independent glands and structures

Adrenal medulla
Parathyroid glands
Pancreatic islets of Langerhans
Hormone-producing cells in various organs (e.g. in the gastrointestinal tract)

✅ Conclusion

The endocrine system maintains the stability of the body’s internal environment (homeostasis) and enables the body to adapt to physical, emotional and environmental factors. Its proper functioning is essential for health as well as for athletic and mental performance.

Author: Irakli Kenchoshvili / Tidanigym.ge

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