how does blood flow from the heart to the lungs
Blood flows into the right atrium, through the tricuspid valve, into the right ventricle, through the pulmonic valve, into the pulmonary artery, through the lungs, out of the lungs into the pulmonary vein, into the left atrium, through the mitral valve, into left ventricle, through the aortic valve, into the aorta, and out to the rest of the body.