Sensory neurones and motor neurones are both surrounded by a myelin sheath.
Describe two differences between the structure of a sensory neurone and the structure of a motor neurone.
An impulse travels along a sensory neurone from a receptor in the foot to the spinal cord. The neurone is 1.2 m long. The impulse travels at 60 m/s.
Calculate the time taken for the impulse to reach the spinal cord.
Use the equation: time === distance ÷ \div\,÷ speed
Give your answer in ms\text{ms}ms.
Multiple sclerosis (MS) is a disease in which the myelin sheath around neurones is damaged.
Suggest why people with MS may have slow and poorly coordinated movements.
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.