[adj., n. ree-fleks; v. ri-fleks]

In biology, an automatic and inborn response to a stimulus that involves a nerve impulse passing from a sensory nerve cell to a muscle or gland without reaching the level of consciousness. Simple reflexes include sucking, swallowing, blinking, scratching, and the knee jerk. Most reflexes consist of complex patterns of many unconsciously coordinated muscular actions that form the basis of much instinctive behavior in animals. Examples include walking, standing, the cat's righting reflex, and basic sexual acts.

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A response is the following:

  • Often a response is the result of a stimulus.
  • In data transmission, a response is the content of the control field of a response frame advising the primary station concerning the processing by the secondary station of one or more command frames.
  • In telecommunications, a response is the effect of a driving signal upon an active or passive device. An output resulting from an input.
  • In liturgy, a response (symbol "R/" or "℟") is a line spoken or sung by a congregation or sung by a choir, answering a versicle.
  • In emergency management, response is one of four phases in the emergency management cycle.
  • In statistics, a response variable or realization thereof.

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