It is an action that results from the reflex arc and consists of a response to a stimulus that is characterized by its involuntariness, that is, they are not motivated by the will of the person issuing them. Whenever a sensory receptor is stimulated by something, the so-called reflex act occurs. When we place our hand on an object that is very hot without realizing it, the body’s response is to immediately withdraw it as soon as we feel the intensity of the heat . Reflex Act
This phenomenal speed that characterizes the reflex act and which in no way could occur in the conscious acts of our brain facilitates an immediate action in the face of something that normally means a threat or physical harm to the person
The question works like this: the sensory neuron is the one that receives the stimulus in question and sends this information to a reflex center that is located in our spinal cord. Once there, the latter will relay it to a motor neuron that is responsible for responding to the stimulus, producing the corresponding muscle movement .
However, the reflex arc, which is the pathway that tries to control the emission of a reflex act, is formed by a series of structures in the nervous system, such as neurons, effectors and receptors
Normally, it is stimuli such as blows or pain that trigger the reflex act, the sensory neuron receives the stimulus and from there, an involuntary response results. It should be noted that it is automatic, there is no intervention of conscience in this case.
It is also important to mention that not all individuals respond to stimuli with which some can respond more quickly to a stimulus, while others take longer to respond. Often, the force of the blow received is decisive for the response given, if it is just a blow that causes the reflex act.