Explain how a stimulus can result in a reflex reaction
Stimulus, e.g. pressure or heat, is detected by receptors. This impulse is carried on neurones. Neurones meet at a synapse where neurotransmitters diffuse across the synapse. The impulse is then carried along a relay neurone then the neurotransmitters cross another synapse and then are carried on a motor neurone which causes muscle contraction to exhibit the reflex action.
RC
Related Biology GCSE answers
All answers ▸Infections can also be caused by viruses. Describe the lytic pathway of a virus and how this causes the spread of infection through a population.
How does increasing temperature affect enzymes in reactions?
Describe the route in which blood runs through the human heart
Explain the lock and key model of enzyme action, including how they are denatured