If it stops beating, that is usually quite a big problem. You can find out more things about heart problems here: https://www.nhs.uk/conditions/#H (Scroll down to the section on hearts!)
Aside from it not beating (haha Kathryn!), you could get a heart attack. That’s when your heart doesn’t get enough blood and parts of it start to die.
You’d think that would be unlikely because the heart is supposed to be full of blood. However, the heart actually gets its nutrients from its own blood vessel, the coronary artery, which is separate from the 4 main chambers used to pump blood.
The coronary artery can get clogged up in the same way your toilet or the gutter in your house might get blocked if there’s too much stuff in the pipes. In this case, the stuff is known as plaque, which can build up over decades of eating unhealthy food, smoking, and not exercising.
You would have serious problems if it spontaneously changed into a brick. Or a banana.
Cos then it wouldn’t be a heart; it’d be a brick or a banana.
And those things aren’t good at being hearts.
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