Hormones by action

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Hormones by Action

Hormones are biochemical substances produced by various glands throughout the body that act as messengers, influencing and controlling bodily functions. They play a crucial role in regulating a wide range of bodily processes, including metabolism, growth and development, tissue function, and mood. The action of hormones can be broadly categorized based on their effects on the body. This article delves into the different types of hormones by their action, highlighting their importance in maintaining homeostasis and overall health.

Types of Hormones by Action[edit | edit source]

Metabolic Hormones[edit | edit source]

Metabolic hormones, such as insulin, glucagon, and thyroid hormones, regulate the metabolism of carbohydrates, fats, and proteins. Insulin, for instance, helps lower blood glucose levels, while glucagon has the opposite effect. Thyroid hormones, including thyroxine (T4) and triiodothyronine (T3), significantly influence the metabolic rate and energy production.

Growth and Development Hormones[edit | edit source]

Hormones like growth hormone (GH) and insulin-like growth factors play a vital role in the growth and development of tissues and organs. Growth hormone, produced by the pituitary gland, stimulates growth, cell reproduction, and regeneration. Insulin-like growth factors, which are influenced by GH, further support the formation and development of bones and other tissues.

Reproductive Hormones[edit | edit source]

Estrogen, progesterone, and testosterone are key reproductive hormones that regulate sexual function and reproduction. Estrogen and progesterone, primarily produced by the ovaries, are crucial for the menstrual cycle, pregnancy, and the development of female secondary sexual characteristics. Testosterone, produced by the testes, is responsible for sperm production and the development of male secondary sexual characteristics.

Stress Hormones[edit | edit source]

Stress hormones, such as cortisol and adrenaline (epinephrine), are released in response to stress. Cortisol, produced by the adrenal glands, helps the body respond to stress by increasing blood sugar levels and suppressing the immune system. Adrenaline increases heart rate, blood pressure, and energy supplies, preparing the body for a 'fight or flight' response.

Sleep and Wakefulness Hormones[edit | edit source]

Melatonin, produced by the pineal gland, regulates the sleep-wake cycle. It is closely associated with the body's circadian rhythms, influencing when we feel alert and when we feel sleepy.

Conclusion[edit | edit source]

Hormones are integral to the proper functioning of the body, with each type playing a specific role in maintaining health and homeostasis. Understanding the different actions of hormones helps in diagnosing and treating various hormonal imbalances and disorders.


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Contributors: Prab R. Tumpati, MD