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Define reflex action. Explain different components of reflex arc. 

1. The receptor at the end of a sensory neuron reacts to a stimulus.

2. The sensory (afferent) neuron conducts nerve impulses along an afferent pathway towards the central nervous system (CNS).

3. The integration center consists of one or more synapses in the CNS.

4. A motor (efferent) neuron conducts a nerve impulse along an efferent pathway from the integration center to an effector.

5. An effector responds to the efferent impulses by contracting (if the effector is a muscle fiber) or secreting a product (if the effector is a gland).

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A reflex action, differently known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus. Scientific use of the term "reflex" refers to a behavior that is mediated via thereflex arc; this does not apply to casual uses of the term "reflex".
  • Receptor - sense organ in skin, muscle, or other organ.
  • Sensory neuron - carries impulse towards CNS.
  • Interneuron - carries impulse within CNS.
  • Motor neuron - carries impulse away from CNS.
  • Effector - structure by which animal responds (muscle, gland, etc).
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