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The sucking reflex seems to belong with the rooting reflex. It is present before birth, and also aids in breastfeeding. It causes the child to instinctively begin to suck on anything that touches the roof of their mouth. This reflex is common to mammals, and specifically designed to express milk through the breastfeeding process. There are two stages to the action.
A withdrawal reflex, also known as a flexor reflex, is a polysynaptic reflex arc. Sensory and motor neurons are part of this reflex, as are association neurons. Pain is the most obvious stimuli that initiates the flexor reflex, as painful stimuli sets the whole reflex into action. reflex arc is in fact the simplest and most primitive nerve pathway in the human body. A reflex arc is designed to administer unconscious automatic actions which are determined to be protective in nature to keep a body in homeostasis.