Biology › Section O · Hormones, bones, and muscles › Topic O.1
Types of hormones and how they work
A hormone reaches nearly every cell in the body, yet only a chosen few respond. Its chemistry decides how it travels, where its receptor sits and how its message gets inside: either straight to the genes or through a chain of messengers.
In this topic
- Chemical messages in the blood
- Three chemical classes
- Steroid hormones
- Amino-acid-derived and peptide hormones
- Target cells and sensitivity
- Intracellular receptors: changing the genes
- Surface receptors and second messengers
- Worked example: classifying a mystery hormone
- Worked example: counting an amplification cascade
- Common mistakes to avoid
- Key takeaways
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