Think about that.  A heart that beats for over 500 years.
This study (http://www.contriving.net/link/du) examines the proteins in the heart of this species and finds…
Collectively, in extremely long-lived molluscs, maintenance of protein homeostasis likely contributes to the preservation of cardiac function.
Bivalve species are interesting to researchers examining aging because the different bivalve species exhibit a wide range of different lifespans.  As such, researchers can examine the differences between them to suss out factors leading to long life.
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Arctica islandica – Wikipedia, the free encyclopedia
Longevity[edit]. These animals show exceptional longevity with a highest reported age of 507 years. In 1868 one specimen, collected alive near Iceland, was 374 years old. The study of its growth rate and the oxygen isotope data showed that it had a highly variable growth at the peak of the …
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