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In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action [1] and nearly instantaneous response to a stimulus. [2] [3] The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
Startle-evoked movement — involuntary initiation of a planned movement in response to a startling stimulus. Startle reflex; Sucking reflex — a primitive reflex, sucking at anything that touches the roof of an infant's mouth. Stretch reflex
An involuntary action is one that is unintentional, i.e. without volition or will; see volition (psychology) and will (philosophy). Involuntary may also refer to: Involuntary, a 2008 Swedish film by Ruben Östlund "Involuntary", a song on the M. Ward album Transfiguration of Vincent; Involuntary action of the body, also known as reflex
The following diagram is provided as an overview of and topical guide to the human nervous system: Human nervous system. Human nervous system – the part of the human body that coordinates a person's voluntary and involuntary actions and transmits signals between different parts of the body.
In anatomy, the extrapyramidal system is a part of the motor system network causing involuntary actions. [1] The system is called extrapyramidal to distinguish it from the tracts of the motor cortex that reach their targets by traveling through the pyramids of the medulla.
The hiccup is an involuntary action involving a reflex arc. [1] Once triggered, the reflex causes a strong contraction of the diaphragm followed about a quarter of a second later by closure of the epiglottis [ citation needed ] , a structure inside of the throat, which results in the "hic" sound.
Echopraxia (also known as echokinesis [1]) is the involuntary repetition or imitation of another person's actions. [1] Similar to echolalia, the involuntary repetition of sounds and language, it is one of the echophenomena ("automatic imitative actions without explicit awareness"). [1]
Autonomic nervous system, showing splanchnic nerves in middle, and the vagus nerve as "X" in blue. The heart and organs below in list to right are regarded as viscera. The autonomic nervous system has been classically divided into the sympathetic nervous system and parasympathetic nervous system only (i.e., exclusively motor).