Deoxygenated blood enters the heart via the:

Blood then flows from the caval veins into the:

Blood then flows from the right atrium through the:

Blood flows through the tricuspid valve into the:

Blood flows from the right ventricle through the:

Blood flows through the pulmonary valve into the:

Blood flows from the pulmonary artery into the:

Blood drops off carbon dioxide and waste in the lungs (via exhalation), picks up oxygen (via inhalation), and then returns to the heart via the:

Blood returns to the heart via the pulmonary veins and enters the:

Freshly-oxygenated blood enters the left atrium, then flows through the:

Blood flows through the bicuspid valve and into the:

Blood flows from the left ventricle through the:

Blood flows through the aortic valve and into the: