A reflex action is an automatic (otherwise called involuntary) neuromuscular action elicited by a defined stimulus.Purves (2004). Neuroscience: Third Edition. Massachusetts, Sinauer Associates, Inc. In most contexts, especially involving humans, a reflex action is mediated via the reflex arc (although this is not always true in other animals, or in more casual usage of the term 'reflex'.) Mechanism A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. Reflexes can be built-in or learnt. For example, a person stepping on a sharp object would initiate the reflex action through the creation of a nociceptive stimulus within specialized sense receptors located in the skin tissue of the foot. The resulting stimulus would be transmitted through an afferent nerve to the spinal cord. This stimulus is usuall

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