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.
Left Side of the Heart. 1  The pulmonary vein empties oxygen-rich blood from the lungs into the left atrium of the heart. 2  As the atrium contracts, blood flows from your left atrium into your left ventricle through the open mitral valve.3  When the ventricle is full, the mitral valve shuts.he pattern described below is repeated over and over, causing blood to flow continuously to the heart, lungs, and body. Right Side of the Heart. 1  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 of the heart.