Neurones are connected to each other at synapses.
Describe how a nerve impulse passes across a synapse from one neurone to the next.
Nerve impulses can only pass across a synapse in one direction.
Explain why.
Some painkillers work at synapses in the spinal cord. The painkiller molecules attach to the receptors on the next neurone. This stops the neurotransmitter attaching to these receptors.
Explain how this painkiller stops a person feeling pain.
43 exam-style questions on Edexcel GCSE Biology 2.3 The nervous system and brain, covering 2.3.1 Structures and functions of the brain, 2.3.2 Imaging brain function with scanning, 2.3.3 Limitations in treating nervous system damage, 2.3.4 Neurones and impulse transmission, and 2.3.5 Structure and function of a reflex arc. Each one has a worked solution and a mark scheme showing where the marks go.