What is a collateral of the heart?

Yes. Your heart has another heart. Well not exactly but it is a bone that moves to pump your heart. That's why when you run the bone shakes and your heart races faster.

your heart dose not have a heart in it. -- Literally speaking, it is physically impossible for a human to have one heart inside of another. However, if you are certain that you feel this "second...

cardio muscle

No you don't have a heart inside your heart. The heart is made up of four chambers though. This is a short explanation about the heart. The heart is a very important muscle that you can't live...

because it doesnt mean love that is competely wrong, i dnt kno why, but i know thts wrong