Final answer:
Nociceptors are the receptors that detect tissue injury by responding to harmful stimuli. They are free nerve endings and can be activated by various damaging factors such as chemicals, heat, cold, and mechanical pressure.
Explanation:
Nociceptors are the receptors that detect tissue injury. These receptors are activated by potentially tissue-damaging stimuli like chemicals, heat, cold, and mechanical pressure. Unlike other touch receptors, nociceptors do not have associated structures and are referred to as free nerve endings.
Learn more about Nociceptors here:
https://brainly.com/question/41140565
