Fight or flight and the evolution of pain
Hard wired into the survival mechanisms of all animals is the perception of pain. Different stimuli, such as heat or cold, foul odors, chemicals or a blunt blow can trigger pain receptors in the body that, in the blink of an eye, jolt the body into classic fight or flight responses. Researcher Shigeru Saito, et. al. have performed the first evolutionary analysis of pain response in chickens by isolating the genes for pain receptors called TRPA1.
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