Answer:
This question is about the circulation of blood towards the heart (deoxygenated blood) and from heart to the whole body (oxygenated blood).
Blood flow path:
Superior vena cava => right atrium => tricuspid valve => right ventricle => pulmonary artery => lungs => pulmonary vein => left atrium => bicuspid valve => left ventricle => aortic valve => aorta => rest of body.
