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| pertaining to an involuntary response to a stimulus, in which the nerve impulse from a receptor is transmitted inward to a nerve center, then transmitted outward to an effector |
| ability to perceive stimuli |
irritation ir·ri·ta·tion (ĭr'ĭ-tā'shən)
n.
Extreme incipient inflammatory reaction of the body tissues to an injury.
The normal response of a nerve or muscle to a stimulus.
The evocation of a reaction in the body tissues by the application of a stimulus.