Neurone P and neurone Q form a synapse. Both neurones are healthy.
A scientist starts an electrical impulse close to the synapse in one neurone and records whether a new electrical impulse starts in the other neurone.
| Trial | Neurone in which the first impulse is started | Neurone being monitored | New impulse detected in the monitored neurone |
|---|---|---|---|
| 1 | P | Q | yes |
| 2 | Q | P | no |
Explain the results in the table.
111 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.