A doctor taps the tendon just below a person's kneecap, and the lower leg kicks forward automatically. When asked, the same person can also choose to straighten their leg.
Which statement explains why the automatic movement begins sooner than the voluntary movement?
The sensory neurone carries the impulse directly to the leg muscle.
The impulses travel along the sensory and motor neurones at a higher speed.
The receptor produces a different type of electrical impulse for the automatic movement.
The pathway has fewer synapses at which neurotransmitter must diffuse.
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.