It seems like their heart rate should be slower since blood doesnt have to flow as far, and adults should be faster.
In: Biology
Their hearts are smaller and need to pump faster to deliver blood everywhere. Think of it like a weed eater vs a car engine. Your weed wacker might have an rpm of 7k-10k where your car runs around 1.5- 3K.
Also athletes have even a slower heart rate because the heart is stronger it’s able to pump more blood in each pulse.
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