Gems

Gems (haemum; Greek haima – blood; synonym: ferroporphyrin) – a nonprotein component of a molecule of hemoglobin which is the protoporphyrin which is in a complex connected with an ion of bivalent iron.

 
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Even if heart of the person does not fight, then he all the same can live during a long period, as the Norwegian fisherman Jan Revsdal showed us. Its "motor" stopped for 4 hours after the fisherman got lost and fell asleep in snow.