Your heart is a strong muscle about the size of your fist. It keeps you alive by pumping blood through tiny tubes called blood vessels. With each beat, it sends oxygen and nutrients to every part of your body so you can run, play, and grow.
A child-friendly rephrasing explaining that the heart is a strong muscle about the size of a fist that pumps blood through blood vessels to keep the body working.
Your heart is a strong muscle about the size of your fist. It keeps you alive by pumping blood through tiny tubes called blood vessels. With each beat, it sends oxygen and nutrients to every part of your body so you can run, play, and grow.