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Flexor reflex is initiated by ____. Which causes the automatic withdrawal of the threatened body part?

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Final answer:

The flexor reflex, which causes the automatic withdrawal of the threatened body part, is initiated by a painful stimulus. For example, stepping on a tack activates nociceptors that activate motor neurons responsible for the contraction of the tibialis anterior muscle, causing dorsiflexion of the foot.

Step-by-step explanation:

The flexor reflex, which causes the automatic withdrawal of the threatened body part, is initiated by a painful stimulus. When a painful stimulus is detected by sensory neurons called nociceptors, they activate motor neurons responsible for the contraction of specific muscles. For example, stepping on a tack activates nociceptors that activate motor neurons responsible for the contraction of the tibialis anterior muscle, causing dorsiflexion of the foot.

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