Unconditioned reflex (unconditioned reflex, UCR) – is an automatic, innate response of the body to certain stimuli from the external or internal environment. These reflexes are present in the organism from birth and do not require special learning or conditions to occur.
Examples of unconditioned reflexes include:
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Knee-jerk reflex: when a medical hammer appears at the knee, the leg automatically jerks in response.
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Muscle stretch reflex: the muscles' response to stretching. For example, when you bend your arm at the elbow, the biceps contract.
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Pupillary reflex: when the eyes are exposed to light, the pupils constrict to reduce the amount of light entering the eye.
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Belching with excess air in the stomach: when excess air accumulates in the stomach, it may trigger belching to expel it.
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Cough in response to airway irritation: if inhaled particles or irritants enter the airways, the body may produce a cough to clear the airways.
These unconditioned reflexes serve protective and adaptive functions of the body, providing rapid and automatic responses to potentially dangerous or important events.
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