The endocrine system is the collection of all hormone-producing glands in the body. These hormones play a key role as chemical messengers in maintaining the homeostasis of the body.
If the endocrine system is dysregulated, problems may occur during puberty, pregnancy, or stress. It may also show up as a tendency to gain weight, osteoporosis, or low energy, largely because too much sugar in the body stays in the bloodstream and doesn’t get into the cells to supply energy.
Some vital organs
The endocrine system is made up of many different glands. The hypothalamus, pituitary gland, and pineal gland are located in the skull; the thyroid and parathyroid glands are located in the neck; the thymus is located in the front of the upper mediastinum, between the two lungs; the adrenal glands are located above the kidneys; the pancreas is located behind the stomach; and either the ovaries (in women) or the testes (in men) are located in the pelvic region.
- Hypothalamus: This organ is the hub that connects the endocrine system to the nervous system, and its main role is to regulate the secretion of hormones from the pituitary glands.
- Pituitary gland: This is the “main” gland of the endocrine system. It receives messages from the brain and “tells” the other glands in the body what to do. This gland produces many important hormones, including growth hormone, prolactin (which promotes lactation in lactating women), and luteinizing hormone (which regulates the release of estrogen in women and testosterone in men).
- Pineal gland: This gland produces a chemical called melatonin, which helps the body fall asleep normally.
- Thyroid gland: This gland releases thyroid hormones that regulate the body’s metabolism. If this gland does not release enough hormone, you will develop hypothyroidism, which manifests as reduced excitability of the systems. The heart rate may slow down, the bowel movement may slow down, and constipation may occur, while the body weight may increase. If too much hormone is released from this gland, you will develop hyperthyroidism, which manifests as accelerated metabolism in all systems, possible tachycardia, diarrhea, and weight loss without deliberate weight loss.
- Parathyroid glands: There are four parathyroid glands, located within the posterior border of the thyroid gland on both sides, two on each side. They are vital to the health of the bones. The parathyroid hormones secreted by this gland play a role in regulating the body’s calcium and phosphorus metabolism.
- Thymus: This gland promotes the production and maturation of T cells that have anti-infective properties. Therefore, it plays a very important role in the development of the immune system in children. After puberty, the thymus gland begins to shrink.
- Adrenal glands: They are known for releasing the “fight or flight” hormone adrenaline (epinephrine), and both glands also release corticosteroids. In addition, these hormones regulate the body’s metabolism and sexual function.
- Pancreas: The pancreas is both part of the digestive system and one of the endocrine organs, secreting digestive enzymes to break down food and releasing two hormones, insulin and glucagon. Insulin and glucagon help regulate the sugar in the blood and cells at normal levels. The pancreas in people with type 2 diabetes does not produce enough insulin, although it usually does produce some amount.
- Ovaries: A woman’s ovaries produce estrogen and progesterone. These hormones help with breast development during puberty, regulation of the menstrual cycle, and maintenance of pregnancy.
- Testes: In males, the testes produce testosterone, which promotes the growth of facial hair and body hair during puberty. Also, the testes promote penile development and play a role in spermatogenesis.
The endocrine system is changing
It is normal to notice some changes in your endocrine system as you get older. The body’s metabolism tends to slow down. Therefore, weight may increase even if there is no change in diet or exercise. Changes in the body’s hormone levels may explain, at least in part, why there is greater susceptibility to heart disease, osteoporosis, and type 2 diabetes as we get older.
No matter how old you are, stress, infections, and the presence of certain chemicals around you can affect the endocrine system. Also, genetics or lifestyle habits can increase the incidence of endocrine disorders such as hypothyroidism, diabetes, or osteoporosis.