Florence, OR Weather Data. 1  Florence, OR Current Weather Data. 2  Sponsored. 3  Florence, OR Historical Weather Trends.  Florence, OR area 1  Highlights. Florence, OR Chance of Sunshine.  Florence, OR Historical 1  Temperature. Florence, OR Rainfall and Snowfall Average.  Florence, OR Energy Demand.
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. Left Side. Oxygen-rich blood returns from the lungs to your heart's left atrium through the pulmonary veins.he mitral valve does this between the left atrium and ventricle. The lub is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles has an outlet valve. The right ventricle uses the pulmonary valve to help move blood into the pulmonary arteries.
Oxygenated blood then returns to the heart via the pulmonary vein, and is emptied into the left atrium. The blood then flows into the left ventricle, where it is pumped out of the heart and into the aorta, the largest artery in the body. Source(s): anatomy and physiology class. Kayy x3 Â· 5 years ago. Thumbs up.