What keeps your heart pumping?

sinoatrial hub – known as the heart's characteristic pacemaker. The motivation begins in a little bundle of specialized cells found within the right chamber, called the SA hub. The electrical action spreads through the dividers of the atria and causes them to contract. This powers blood into the ventricles

I put it in my own words so you don't get it wrong. Hope this helps :)

-ilovejiminssi♡

c. flammable gases, patient lying in standing water, combustible liquids near the victim