HuckyBuddy thoroughly explained it, but I’ll see if I can simplify it a little more.
Eli5
Imagine your heart is a patient, and your brain is a doctor 👨⚕️
To keep your heart happy & healthy, your brain needs to know a whole bunch about how mister heart is feeling.
Mister heart, on the other hand, mainly needs to know one thing: how fast or slow to beat 💓
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