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The Reflex Arc The Reflex Arc Reflexes are automatic - don’t have to think about them Message doesn’t have to go to brain for response to occur, sent directly to spinal cord Since there is no processing, reactions can be very quick spinal cord The Reflex Arc Only three neurons involved: sensory, interneuron, motor Small number of neurons involved makes response faster interneuron motor neuron spinal cord sensory neuron The Reflex Arc Step 1: Stimulus sensed by sensory receptor Step 2: Action potential travels down sensory neuron Step 3: Interneuron in spinal cord (integrator) transfers message from sensory neuron to motor neuron Step 4: Motor neuron sends message to muscle Step 5: Muscle (effector) contracts motor neuron receptor stimulus interneuron sensory neuron muscle The Reflex Arc Step 1: Stimulus sensed by sensory receptor Electrical message that travels along each axon is converted to Step 2: Action potential travels down sensory neuron a chemical one at each synapse Step 3: Interneuron in spinal cord (integrator) transfers How sensory many synapses there?neuron Only two message from neuron are to motor Fewer synapses means response is faster Step 4: Motor neuron sends message to muscle motor neuron receptor stimulus interneuron sensory neuron muscle