Question

A sudden and spontaneous reflex which leads to the quick pulling of hand on touching a hot object is generated by
I. Brain
II. Spinal cord
III. Sensory neurons
IV. Motor neurons

• A. I and IV
• B. III and IV
• C. I, III and IV
• D. II, III and IV
• E. I, II, III and IV

Answer 1

The correct option is D II, III and IV

A reflex action is defined as a spontaneous, involuntary, automated, nerve-mediated activity produced at the unconscious level by stimulating specific receptors. In other words, a reflex action is a sensory impulse, automatically converted into a motor effect with the involvement of the central nervous system. These actions are sudden and automatic and take place even before one can feel the stimulus through the brain. The quick pulling of the hand on touching a hot object is an automated response to stimuli and is controlled and regulated by the spinal cord along with the sensory and motor neurons which connect the receptor and effector organs. Thus, the correct answer is option C.