Mechanoreceptors are activated by which type of stimulus?

• A. Mechanical force
• B. Heat
• C. Chemicals
• D. Electromagnetic

Answer: (A)

Mechanoreceptors respond to physical deformation—mechanical energy that produces pressure, touch, vibration, or stretch. When such mechanical force deforms the receptor, it opens ion channels and converts the stimulus into a nerve signal. That connection to mechanical energy is why the correct answer is mechanical force. Heat would engage thermoreceptors, chemicals would engage chemoreceptors, and electromagnetic inputs are handled by other specialized pathways, not the mechanoreceptors responsible for sensing touch, pressure, and movement.