Thyroid and Parathyroid
Glands
This article gives a brief overview of the thyroid and
parathyroid glands and the hormones that they make.
What are the thyroid and parathyroid glands?
Both the thyroid and parathyroid glands are endocrine glands.
This means they make and secrete (release) hormones. Hormones are chemicals
which can be released into the bloodstream. They act as messengers, affecting
cells and tissues in distant parts of your body. Thyroid hormones affect the
body's metabolic rate and the levels of certain minerals in the blood. The
hormone produced by the parathyroid also helps to control the amount of these
essential minerals.
Where is the thyroid found?
The thyroid
gland is found in the front part of your neck, just below the large cartilage
tissue in your neck (your 'Adam's apple'). It is made up of two lobes - the
right and the left lobes. These two lobes are joined by a small bridge of
thyroid tissue called the isthmus. The two lobes lie on either side of your
trachea (windpipe).
What does the thyroid do?
The thyroid makes three hormones that it secretes into the
bloodstream. Two of these hormones, called thyroxine (T4) and triiodothyronine
(T3), increase your body's metabolic rate. Essentially the body's metabolic
rate is how quickly the cells in your body use the energy stored within them.
Thyroid hormones make cells use more energy. By controlling how much energy our
cells use, thyroid hormones also help to regulate our body temperature. Heat is
released when energy is used, increasing our body temperature. Thyroid hormones
also play a role in making proteins, the building blocks of the body's cells.
They also increase the use of the body's fat and glucose stores.
In order to make T3 and T4 the thyroid gland needs iodine, a substance found in the food we eat. T4 is called this because it contains four atoms of iodine. T3 contains three atoms of iodine. In the cells and tissues of the body most T4 is converted to T3. T3 is the more active hormone, it influences the activity of all the cells and tissues of your body.
The other hormone that the thyroid makes is called calcitonin. This helps to control the levels of calcium and phosphorus in the blood. These minerals are needed, among other things, to keep bones strong and healthy.
In order to make T3 and T4 the thyroid gland needs iodine, a substance found in the food we eat. T4 is called this because it contains four atoms of iodine. T3 contains three atoms of iodine. In the cells and tissues of the body most T4 is converted to T3. T3 is the more active hormone, it influences the activity of all the cells and tissues of your body.
The other hormone that the thyroid makes is called calcitonin. This helps to control the levels of calcium and phosphorus in the blood. These minerals are needed, among other things, to keep bones strong and healthy.
How does the thyroid work?
The main job of the thyroid gland is to produce hormones T4 and
T3. To do this the thyroid gland has to take a form of iodine from the
bloodstream into the thyroid gland itself. This substance then undergoes a
number of different chemical reactions which result in the production of T3 and
T4.
The activity of the thyroid is controlled by hormones produced by two parts of the brain, the hypothalamus and the pituitary. The hypothalamus receives input from the body about the state of many different bodily functions. When the hypothalamus senses levels of T3 and T4 are low, or that the body's metabolic rate is low, it releases a hormone called thyrotropin-releasing hormone (TRH). TRH travels to the pituitary via the connecting blood vessels. TRH stimulates the pituitary to secrete thyroid-stimulating hormone (TSH).
The activity of the thyroid is controlled by hormones produced by two parts of the brain, the hypothalamus and the pituitary. The hypothalamus receives input from the body about the state of many different bodily functions. When the hypothalamus senses levels of T3 and T4 are low, or that the body's metabolic rate is low, it releases a hormone called thyrotropin-releasing hormone (TRH). TRH travels to the pituitary via the connecting blood vessels. TRH stimulates the pituitary to secrete thyroid-stimulating hormone (TSH).
TSH is released from the pituitary into the bloodstream and travels to the thyroid gland. Here TSH causes cells within the thyroid to make more T3 and T4. T3 and T4 are then released into the bloodstream where they increase metabolic activity in the body's cells. High levels of T3 stop the hypothalamus and pituitary from secreting more of their hormones. In turn this stops the thyroid producing T3 and T4. This system ensures that T3 and T4 should only be made when their levels are too low.
Calcitonin is released by the thyroid gland if the amount of calcium in the bloodstream is high. Calcitonin decreases the amount of calcium and phosphorus in the blood. It does this by slowing the activity of cells found in bone, called osteoclasts. These cells cause calcium to be released as they 'clean' bone. Calcitonin also accelerates the amount of calcium and phosphorus taken up by bone. Calcitonin works with parathyroid hormone to regulate calcium levels (see below for full explanation).
Where are the parathyroid glands found?
The body has four parathyroid glands. They are small, pea-sized
glands, located in the neck just behind the butterfly-shaped thyroid gland. Two
parathyroid glands lie behind each 'wing' of the thyroid gland.
What do the parathyroid glands do?
The parathyroid glands release a hormone called parathyroid
hormone. This hormone helps to control the levels of three minerals in the
body: calcium, phosphorus and magnesium. Parathyroid hormone has a number of
effects in the body:
- It causes the release
of calcium from bones.
- It causes calcium to
be absorbed (taken up into the blood) from the intestine.
- It stops the kidneys
from excreting (getting rid of) calcium in the urine.
- It causes the kidneys
to excrete phosphate in the urine.
- It increases blood
levels of magnesium.
How do the parathyroids work?
Normally, parathyroid hormone release is triggered when the
level of calcium in the blood is low. When the calcium level rises and is back
to normal, the release of parathyroid hormone from the parathyroids is
suppressed. However, parathyroid hormone and calcitonin work together to
control calcium levels in the blood. The blood calcium level is the main
stimulus for the release of these hormones, as the release of these hormones is
not controlled by the pituitary.
When the calcium level is high in the bloodstream, the thyroid gland releases calcitonin. Calcitonin slows down the activity of the osteoclasts found in bone. This decreases blood calcium levels. When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone. Parathyroid hormone encourages the normal process of bone breakdown (essential for maintenance and growth of the bone). This process of bone breakdown releases calcium into the bloodstream. These actions raise calcium levels and counteract the effects of calcitonin. By having two hormones with opposing actions, the level of calcium in the blood can be carefully regulated.
Parathyroid hormone also acts on the kidneys. Here it slows down the amount of calcium and magnesium filtered from the blood into the urine. Parathyroid hormone also stimulates the kidneys to make calcitriol, the active form of vitamin D. Calcitriol helps to increase the amount of calcium, magnesium and phosphorus absorbed from your intestines (guts) into the blood.
When the calcium level is high in the bloodstream, the thyroid gland releases calcitonin. Calcitonin slows down the activity of the osteoclasts found in bone. This decreases blood calcium levels. When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone. Parathyroid hormone encourages the normal process of bone breakdown (essential for maintenance and growth of the bone). This process of bone breakdown releases calcium into the bloodstream. These actions raise calcium levels and counteract the effects of calcitonin. By having two hormones with opposing actions, the level of calcium in the blood can be carefully regulated.
Parathyroid hormone also acts on the kidneys. Here it slows down the amount of calcium and magnesium filtered from the blood into the urine. Parathyroid hormone also stimulates the kidneys to make calcitriol, the active form of vitamin D. Calcitriol helps to increase the amount of calcium, magnesium and phosphorus absorbed from your intestines (guts) into the blood.
Some disorders of the thyroid and parathyroid
glands
- Goitre (Thyroid
Swelling)
- Hyperparathyroidism -
Overactive Parathyroid
- Hyperthyroidism -
Overactive Thyroid
- Hypoparathyroidism -
Underactive Parathyroid
- Hypothyroidism -
Underactive Thyroid
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