The reflex action

In Biology, our teacher gave us an assignment to work on the reflex action. I have worked with Juana Zufriategui and Francisco Montoya. This is our work;

1- search in the internet a video showing an example of a reflect action


2- explain the term reflex action


reflex arc the circuit traveled by impulses producing a reflex action: receptor organ, afferent nerve, nerve center, efferent nerve, effector organ in a muscle; see also reflex.


a simple neurological unit of a sensory neuron that carries a stimulus impulse to the spinal cord, where it connects with a motor neuron that carries the reflex impulse back to an appropriate muscle or gland.


3- state the structures involved in a reflex arc

  • Receptor: sense organ in skin, muscle, or other organ
  • Sensory neurons: carries impulse towards CNS
  • Interneuron= relay neurone: carries impulse within CNS and is in the spinal cord
  • Motor neurones: carries impulse away from CNS
  • Effector : structure by which animal responds (muscle, gland, etc).

4- explain how the reflex action in your video takes place


The video explains that reflex action occurs when we withdraw the part of the body that is the most vulnerable, as a result of coming close to a harmful object.  When the person touches a hot cup, for instance, the sensory receptors in the hand send a stimulus via the afferent pathway which contains stimulus neurons to the spinal cord. This ones enter the dorsal nerve root of the spinal cord. The stimulus is passed onto the neuron, which travels to reach the  effector organ. The brain in not involved in the reflex . The receptors neurons takes the stimulus produced to the spinal cord.



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