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An involuntary action is one which occurs without the conscious choice of an organism. If it occurs specifically in response to a stimulus, it will be known as a reflex. Involuntary actions are opposite of voluntary actions that occur because of choice. Involuntary actions may or may not occur with the awareness of the organism performing it. Common involuntary actions displayed by humans and most other mammals are heartbeat, hiccups, digestion, coughing and sneezing. Breathing can also be considered both involuntary and voluntary, since the breath can be held through apnea. == See also == * Voluntary action * Instinctive drowning response 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「involuntary action」の詳細全文を読む スポンサード リンク
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