IGCSE Biology Notes: Coordination & Response
IGCSE biology notes on coordination cover reflex arcs, synapses, hormones vs nerves, and homeostasis examples (blood glucose, temperature).
Hub: IGCSE biology notes · Coordination guide · Nervous system exam tips.
Reflex arc (draw from memory)
Stimulus → receptor → sensory neurone → relay → motor → effector → response.
Hormones table
| Feature | Nerves | Hormones |
|---|---|---|
| Speed | Fast | Slower |
| Path | Electrical/chemical synapse | Blood |
| Duration | Short | Longer |
Homeostasis
Negative feedback loop sketch for insulin/glucagon if on your tier.
Frequently asked questions
Is adrenaline in IGCSE notes?
Yes — fight/flight bullet list on hormone page.
Eye reflex?
Include if past papers from your centre use it.
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