• No idea
  • That's trivially easy. 0.5% is the same as 0.005 times as much. So if a mammal weighs X, their heart weighs 0.005X, according to that model. Of course, this model is not very correct, since the weight of an organism varies more widely than the weight of that organism's heart. Take a Blue Whale for example. The Blue Whale weighs between 110 000 lbs and 330 000 lbs, but heart specimens generally weigh around 400 lbs. That's 1.2-3.6% of the animal's weight. On the other side of the spectrum, a house mouse weighs, on average, 0.68 oz, and it's heart .0058 oz, which is 8.6% of the animal's weight. So, the correlation is not linear.
    • bostjan the adequate 🥉
      But, for reference, the average human heart weighs about 10 ounces, or 0.625 lbs.

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