Question

In a reflex action, the reflex arc is formed by

Answer 1

Reflex action:

1. A reflex action is a sudden, unexpected involuntary response to a stimulus.
2. This occurs by the pathway of a reflex arc.
3. It occurs as follows:

• Receptor: It receives the stimulus from the environment.
• Afferent neuron: This neuron sends the impulse of sensation of the stimulus from the receptor to the coordinating centre.
• Coordinating centre: This is usually the spinal cord which is responsible for deciding the course of action to be taken.
• Efferent neuron: This neuron relays the impulse from the coordinating centre to the effector.
• Effector: It is responsible for conducting the effect via the muscles involved.

Final answer: In a reflex action, the reflex arc is formed by the impulse from the receptor.