Question

Identify the parts labelled 1 to 5.

• A. 1. Effector 2. Efferent neuron 3. Integration center 4. Afferent neuron 5. Receptor
• B. 1. Receptor 2. Afferent neuron 3. Integration center 4. Efferent neuron 5. Effector
• C. 1. Receptor 2. Afferent neuron 3. Efferent neuron 4. Integration center 5. Effector
• D. 1. Effector 2. Afferent neuron 3. Integration center 4. Efferent neuron 5. Receptor

Answer 1

The correct option is B

1. Receptor 2. Afferent neuron 3. Integration center 4. Efferent neuron 5. Effector

Sudden spontaneous, involuntary reaction to a stimulus without involvement of brain is called reflex action.

Example: Sudden withdrawal of the body part which comes in contact with objects that are extremely hot, cold, pointed or sharp.

Reflex arc: Receptor organ → sensory or Afferent neuron → Integration neuron → Motor or Efferent neuron → Effector organ