Glandular Hormone – Definition, Function & Disorders
Glandular hormones are chemical messengers produced by the body´s endocrine glands and released into the bloodstream. They regulate vital functions such as metabolism, growth, and reproduction.
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Glandular hormones are chemical messengers produced by the body´s endocrine glands and released into the bloodstream. They regulate vital functions such as metabolism, growth, and reproduction.
What Is a Glandular Hormone?
A glandular hormone is a chemical messenger synthesized by an endocrine (hormone-producing) gland and secreted directly into the bloodstream. Once in circulation, the hormone travels to its target organs and triggers specific biological responses. Glandular hormones are essential for regulating nearly every bodily function, including metabolism, growth, mood, and reproduction.
Key Hormone-Producing Glands
The human body contains a range of endocrine glands, each producing specific hormones:
- Pituitary gland: Produces growth hormone (GH), thyroid-stimulating hormone (TSH), and adrenocorticotropic hormone (ACTH), among others. It acts as the master control gland of the endocrine system.
- Thyroid gland: Produces thyroxine (T4) and triiodothyronine (T3), which regulate energy metabolism.
- Adrenal glands: Secrete adrenaline (epinephrine), noradrenaline (norepinephrine), and cortisol, hormones that govern the body´s stress response.
- Pancreas: Releases insulin and glucagon to regulate blood sugar levels.
- Gonads (testes and ovaries): Produce testosterone, estrogen, and progesterone to control reproduction and sexual development.
- Parathyroid glands: Secrete parathyroid hormone (PTH) to regulate calcium balance.
Mechanism of Action
Glandular hormones are typically released in response to signals from the brain or changes in body chemistry (e.g., blood glucose or calcium levels). They bind to specific receptors on target cells and initiate a biochemical response. Hormone secretion is controlled by feedback mechanisms: when sufficient hormone is present in the blood, further production is suppressed.
Chemical Classes of Glandular Hormones
- Peptide hormones: Composed of amino acid chains (e.g., insulin, growth hormone)
- Steroid hormones: Synthesized from cholesterol (e.g., cortisol, estrogen, testosterone)
- Amino acid derivatives: Derived from single amino acids (e.g., thyroid hormones, adrenaline)
Diseases Caused by Hormonal Imbalances
Both excess and deficiency of glandular hormones can lead to serious medical conditions:
- Hypothyroidism: Insufficient thyroid hormone causes fatigue, weight gain, and sensitivity to cold.
- Hyperthyroidism: Excess thyroid hormone leads to rapid heartbeat, weight loss, and anxiety.
- Diabetes mellitus: Impaired insulin production or action results in elevated blood sugar levels.
- Cushing's syndrome: Excess cortisol due to an overactive adrenal cortex.
- Acromegaly: Overproduction of growth hormone in adulthood causing abnormal tissue growth.
Diagnosis and Treatment
Hormonal disorders are typically diagnosed through blood tests measuring hormone levels in serum. Imaging techniques such as ultrasound or MRI may also be used to evaluate the glands themselves.
Treatment depends on the underlying cause and may include:
- Hormone replacement therapy (e.g., thyroxine for hypothyroidism)
- Medications to suppress hormone overproduction
- Surgical removal of hormone-secreting tumors
- Radioiodine therapy for thyroid disorders
References
- Kasper, D. L. et al. – Harrison's Principles of Internal Medicine. McGraw-Hill Education, 20th edition, 2018.
- Melmed, S. et al. – Williams Textbook of Endocrinology. Elsevier, 14th edition, 2019.
- World Health Organization (WHO) – Noncommunicable Diseases: Endocrine Disorders. Available at: https://www.who.int
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