Explain briefly how the stimulus at the finger produces an impulse in the sensory neurone using the following key words. 1. Energy conversion (linked to receptor) 2. Na+ in 3. Depolarization 4. Receptor/ generator potential 5. Ref to threshold 6. Therefore action potential/ wave of depolarisation Describe role of the motor neurone in the reflex arc using the following key words. 1. (in/ from) CNS/ brain/ spinal cord 2. Refer to synapse with intermediate/ relay neurone 3. Ref to neuromuscular junction/ neurotransmitter released 4. Ref response