Question

What makes a heart beat?

Answer 1

hey mate I found something in my textbook for you and I think it might help you
hope it help you thank you

Answer 2

The heart has four chambers, two upper and two lower. The upper chambers are called the right and left atria, and the two lower are the right and left ventricles. A valve connects each atrium with its corresponding ventricle. The tricuspid valve connects the right atrium and ventricle, and the mitral valve connects the left atrium and ventricle. Two additional valves complete the set: the pulmonic valve connects the right ventricle with the pulmonary artery and the aortic valve connects the left ventricle with the aorta. These four valves function like gates, allowing blood to flow in one direction with each heartbeat -- about 2,000 gallons of blood every day.