Reflex Action & Arc (NCERT) - Free MCQ Practice Test with solutions, JAMB

Trained dog salivates when you ring a bell is the example of conditioned reflex. Conditioned reflexes are acquired reflexes, dependent on past experience, training and learining.

The correct pathway of reflex arc is : Sensory stimulus → Dentrite of sensory neuron → Axon of sensory neuron → CNS → Dendrite of motor neuron → Axon of motor neuron → Effector organ

The afferent neruron receive signal from a sensory organ and transmits the impulse the via a dorsal nerve root into CNS (at level of spinal cord).

An automatic (involunatary) neuromuscular action elicited by defined stimulus is called reflex action. Sweating is not reflex action. It is primarily a means of temperature regulation.

To identify the different labels A, B, C, D, E, F in the reflex arc path:
- A (a): stimulus.
- B (b): Receptor
- C (c): Sensory neuron that carries the impulse to the central nervous system (CNS).
- D (d): Motor neuron that transmits the response from the CNS.
- E: (d) Effector (muscle or gland) that produces the response.
In the given image, label B represents the sensory neuron carrying the impulse to the CNS.