A person damages their spinal cord in the lower back.
They can no longer move their legs, but their arms work normally.
Which statement explains this and why the paralysis is likely to be permanent?
Impulses from the legs cannot reach the arms directly, and nerve tissue repairs very quickly.
The leg muscles are damaged by the injury, and muscle tissue cannot repair itself at all.
Impulses from the brain cannot pass the damage to reach the legs, and nerve tissue repairs poorly.
The brain is damaged by the injury, so it can no longer send impulses to any part of the body.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.