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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