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The Mishnah explicitly indicates that the prohibition of blood divides into two categories: organ blood (dam eivarim), for which one violates a negative commandment, and lifeblood (dam ha-nefesh), for which one incurs karet.
At first glance, one might understand these as two separate prohibitions: the prohibition of organ blood, punishable by lashes, and the prohibition of lifeblood, punishable by karet. Yet all the enumerators of the commandments count the prohibition of organ blood and that of lifeblood as a single prohibition. We must therefore investigate the relationship between organ blood and lifeblood.