Why do the muscles in our heart don’t expand or grow like other muscles although they keep working all the time?
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There are different types of muscles: smooth, skeletal etc. skeletal muscle is what helps us move and what body builders go to the gym to build up.
I think the “grow” u are talking about is caused the micro tears or micro lesions, that happen when the muscle is put under strain (when lifting weights, and u get the idea) when these muscles heal, they gain volume.
They can. Translated from my language that’s called ‘athlete’s heart’. They’re actually less efficient than regular hearts and can cause a lot of health issues.