Biology A-Level
Hormones
What Hormones means in Biology A-Level, as defined for OCR.
Definition of Hormones
Check what you remember
Read the wording for your board, then hide it and explain Hormones in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Chemical messengers secreted by endocrine cells directly into the blood plasma, not into ducts.
Topics that use Hormones
- Hormonal communication (OCR A-Level)
Related terms
- Adrenaline and fight-or-flight
- Blood glucose and salt balance
- Blood transport of hormones
- Endocrine signalling
- Exocrine versus endocrine organisation of the pancreas
- Glucagon and α cells
- Insulin and β cells
- Insulin resistance
Using Hormones in the exam
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