26/09/2025
𝗕𝗹𝗼𝗼𝗱 𝗙𝗹𝗼𝘄 𝗧𝗵𝗿𝗼𝘂𝗴𝗵 𝘁𝗵𝗲 𝗛𝗲𝗮𝗿𝘁
1. Unoxygenated blood enters the heart through the superior and inferior vena cavae.
2. Blood flows into the right atrium.
3. It passes through the tricuspid (right AV) valve into the right ventricle.
4. The right ventricle contracts, forcing the pulmonic (pulmonary semilunar) valve open.
5. Blood flows into the pulmonary trunk and through the pulmonary arteries to the lungs.
6. In the lungs, blood unloads carbon dioxide and picks up oxygen.
7. Oxygen-rich blood returns from the lungs via the pulmonary veins.
8. Blood flows into the left atrium.
9. It passes through the bicuspid (mitral/left AV) valve into the left ventricle.
10. The left ventricle contracts, forcing the aortic semilunar valve open.
11. Blood flows into the aorta.
12. Oxygenated blood is distributed to the entire body, where it delivers oxygen and nutrients before returning (deoxygenated) through the vena cavae.