Irritation in organisms Irritation

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pearl oyster


it not proven oysters can feel pain, known react irritants. when irritating object becomes trapped within oyster s shell, deposits layers of calcium carbonate (caco3), increasing in size , producing pearl. purely defense mechanism, trap potentially threatening irritant such parasite inside shell, or attack outside, injuring mantle tissue. oyster creates pearl sac seal off irritation.


it has been observed amoeba avoids being prodded pin, there not enough evidence suggest how feels this. irritation apparently universal sense shared single-celled creatures.


it postulated such beings feel pain, projection – empathy. philosophers, notably rené descartes, denied entirely, such higher mammals dogs or primates monkeys; descartes considered intelligence pre-requisite feeling of pain.







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