The pituitary gland, often called the “master gland,” produces and releases several hormones that regulate key body functions. It consists of two main parts: the anterior pituitary and the posterior pituitary. Each section secretes different hormones that influence growth, metabolism, reproduction, stress, and fluid balance.
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Anterior Pituitary Hormones and Their Effects
The anterior pituitary (adenohypophysis) produces hormones in response to signals from the hypothalamus. These hormones affect multiple organs and endocrine glands.
1. Growth Hormone (GH)
- Target: Bones, muscles, liver
- Effect: Stimulates tissue growth and cell reproduction; increases protein synthesis and fat metabolism
📘 Related reading: Khan Academy – Growth Hormone
2. Thyroid-Stimulating Hormone (TSH)
- Target: Thyroid gland
- Effect: Stimulates the release of T3 and T4, which regulate metabolism, heart rate, and temperature
3. Adrenocorticotropic Hormone (ACTH)
- Target: Adrenal cortex
- Effect: Stimulates the production of cortisol, which helps the body respond to stress, maintain blood sugar, and reduce inflammation
4. Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH)
- Target: Ovaries and testes
- Effect:
- FSH promotes egg development and sperm production
- LH triggers ovulation and testosterone production
🔬 Learn more at Visible Body – Pituitary Hormones
5. Prolactin (PRL)
- Target: Mammary glands
- Effect: Stimulates milk production after childbirth
Posterior Pituitary Hormones and Their Effects
The posterior pituitary (neurohypophysis) stores and releases hormones made in the hypothalamus.
1. Oxytocin
- Target: Uterus and mammary glands
- Effect:
- Triggers uterine contractions during labor
- Promotes milk ejection during breastfeeding
- Associated with bonding and emotional connections
2. Antidiuretic Hormone (ADH or Vasopressin)
- Target: Kidneys
- Effect:
- Promotes water reabsorption in the kidneys
- Helps maintain blood pressure and prevent dehydration
📚 Reference: TeachMeAnatomy – Pituitary Gland
Summary Table
| Hormone | Source | Target | Effect |
|---|---|---|---|
| GH | Anterior pituitary | Body tissues, liver | Promotes growth |
| TSH | Anterior pituitary | Thyroid gland | Increases thyroid hormone secretion |
| ACTH | Anterior pituitary | Adrenal cortex | Stimulates cortisol release |
| FSH & LH | Anterior pituitary | Ovaries, testes | Regulate reproductive function |
| PRL | Anterior pituitary | Mammary glands | Stimulates milk production |
| Oxytocin | Posterior pituitary | Uterus, mammary glands | Aids labor and milk ejection |
| ADH | Posterior pituitary | Kidneys | Conserves water, raises blood pressure |
Conclusion
The effects of the hormones of the pituitary reach nearly every part of the body. Whether it’s controlling growth, stimulating thyroid function, helping the body respond to stress, or managing reproduction and fluid levels, the pituitary is central to hormonal regulation and homeostasis. Understanding these effects is crucial in diagnosing and managing various endocrine disorders.
🧠 For animations and diagrams, visit InnerBody – Pituitary Gland