The Pathway of Blood Flow Through the Heart (The Coronary Circulation)
Step #1
Blood enters right atrium from superior and inferior venae caveae.
Step #9
Blood flows through aortic valve into ascending aorta.
Step #4
Blood flows through pulmonary valve into pulmonary trunk.
Step #10
Blood in aorta is distributed to every organ in the body, where it unloads oxygen(O2) and loads carbon dioxide (CO2).
Step #7
Blood in left atrium flows through left AV valve into left ventricle.
Step #2
Blood in the right atrium flows through right atrioventricular(AV) valve into right ventricle.
Step #5
Blood is distributed by right and left pulmonary arteries to the lungs, where it unloads co2(carbon dioxide) and loads o2(oxygen).
Step #6
Blood returns from lungs via pulmonary veins to left atrium.
Step #11
Blood returns to right atrium via venae cavae.
Step #8
Contraction of the left ventricle( simultaneous with step 3) forces aortic valve to open.
Step #3
Contraction of the right ventricle forces pulmonary valve open.
Coronary Circulation
blood vessels of the heart wall.