What you'll learn
How organisms detect and respond to change.
Key ideas
- Neurones, synapses and the reflex arc.
- Hormones (e.g. insulin, adrenaline); plant tropisms and auxin.
Exam tips
- Learn the reflex arc order.
- Compare nervous and hormonal responses.
Common mistakes
- Confusing sensory and motor neurones.
- Muddling insulin and glucagon.