Nikolas
Created page with "== The structure of the heart == The heart consists of four chambers, two atria and two ventricles. We can divide the heart into two units, one left unit and one right unit, each unit consisting of one atrium and one ventricle. Venous blood from the body enters the right atrium through the superior and inferior vena cavae. Blood is pumped from the right atrium into the right ventricle through the tricuspid valve. Blood is then pumped from the right ventricle through the..."
