A brain infection damages part of the central nervous system. A course of antibiotics successfully clears the infection. Several months later, the person still cannot form new memories.
Which statement best explains this result?
Damaged CNS axons regrow slowly, so the memory pathway has not reformed.
The blood brain barrier blocks the impulses needed to form new memories.
Treatment cannot replace mature CNS neurones already destroyed by the infection.
Mature brain neurones divide slowly, so replacement takes several years.
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.