Veins -> superior and inferior vena cavas -> right atrium -> tricuspid valve -> right ventricle -> pulmonary semilunar valve -> pulmonary trunk -> right and left pulmonary arteries -> lungs -> right and left pulmonary veins -> left atrium -> mitral (bicuspid) valve -> left ventricle -> aortic semilunar valve -> aorta -> arteries -> arterioles -> capillaries -> venules -> veins