Your heart is a super cool and busy muscle. It works all day and night just for you. When you look at a simple heart diagram, you can see how it keeps you alive. It is about the size of your own littl...
Browsing Tag: Simple Heart Diagram
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Your heart is a super cool and busy muscle. It works all day and night just for you. When you look at a simple heart diagram, you can see how it keeps you alive. It is about the size of your own littl...