Anatomy & Physiology › Section O · The endocrine system › Topic O.3
The thyroid and parathyroid glands
Two neighbours in the neck do very different jobs. The thyroid sets how fast cells burn fuel, using a hormone built from iodine, while the tiny parathyroid glands keep blood calcium within a narrow range that nerves and muscles depend on.
In this topic
- A butterfly in the neck
- Building thyroid hormone
- Carriage, activation and control
- What thyroid hormones do
- When thyroid output is wrong
- Worked example: reading a feedback pattern
- The parathyroid glands and PTH
- Calcitonin and the balance of calcium
- Worked example: a low calcium result
- Common mistakes to avoid
- Key takeaways
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