0
0
Key facts
- There are many endocrine glands in your body that release different hormones.
- Many of these glands are controlled by the hypothalamus and the pituitary gland (also known as the master gland) in your brain.
- There are many medical conditions that can affect your glands and cause hormonal problems.
What is the hormonal system?
The hormonal system (also called the endocrine system) has various glands that release different hormones.
Hormones are like the body’s communication system. They take messages from one part of your body (the gland) to another part of your body (the target cell).
What are endocrine glands?
Endocrine glands release hormones into your bloodstream. Your endocrine glands influence reproduction, metabolism, growth and many other functions.
You also have exocrine glands in your body — these are glands that make and release chemicals into a duct. For example, you have exocrine glands in your digestive system.
The hypothalamus and pituitary gland
The hypothalamus is an area of your brain that links your brain to your hormonal system.
The hypothalamus is connected to the pituitary gland (a small gland at the base of your brain) by a stalk.
Some of the hormones released by your hypothalamus help control your pituitary gland, also known as the ‘master gland’. The pituitary gland in turn controls many of the other endocrine glands, including your:
- thyroid gland
- adrenal glands
- ovaries
- testes
The hypothalamus and the pituitary gland also make some hormones that don’t directly act on other glands in the body.
What hormones does my hypothalamus make?
Hormones made in the hypothalamus include:
- growth hormone releasing hormone (GHRH)
- thyrotrophin releasing hormone (TRH)
- corticotrophin releasing hormone (CRH)
- gonadotrophin releasing hormone (GnRH)
- oxytocin
- vasopressin (also called anti-diuretic hormone)
- dopamine
- somatostatin
What hormones does my pituitary gland make?
Your pituitary gland makes:
- growth hormone (GH)
- thyroid stimulating hormone (TSH)
- adrenocorticotrophic hormone (ACTH)
- follicle stimulating hormone (FSH)
- luteinising hormone (LH)
- prolactin
Your pituitary gland also stores and releases some of the hormones made by your hypothalamus, including:
- oxytocin
- vasopressin
What are the other endocrine glands and what do they do?
The other endocrine glands are found in various places in your body. They release different hormones that have many different actions.
| Endocrine gland | Action | Hormone(s) made |
|---|---|---|
Thyroid gland | Your thyroid is a gland found in the front of your neck. Hormones made in your thyroid influence your:
|
|
Parathyroid glands | Your parathyroid glands are 4 small glands in your neck that regulate calcium levels in your blood. |
|
Adrenal glands | Your adrenal glands sit on top of your kidneys. Your adrenal glands influence your:
|
|
Pineal gland | Your pineal gland is a very small gland near the centre of your brain. It helps keep your circadian rhythm (your internal body clock). |
|
Pancreas | Your pancreas is a long gland found behind your stomach, under your liver. The pancreas is an exocrine and endocrine gland. The main endocrine function of the pancreas is to control your blood sugar levels. |
|
Ovaries | Your ovaries are 2 glands found on each side of your womb. The ovaries store and release eggs and make hormones involved in puberty and reproduction. |
|
Testes | The testes are 2 glands found in the scrotum. The testes make sperm and hormones involved in puberty and reproduction. |
|
You can develop a medical condition if your endocrine glands make too much or not enough hormones.
There are many different causes of endocrine conditions, and treatment depends on the cause.
