What would the formula be for the following stick model? 
Definitions:
Left Atrium
One of the four chambers of the heart, receiving oxygenated blood from the lungs and pumping it into the left ventricle.
Deoxygenated Blood
Blood that has released its oxygen to the body's cells and is returning to the heart to be sent to the lungs for oxygenation.
Umbilical Artery
One of two arteries that carry deoxygenated blood from a fetus to the placenta in the umbilical cord.
Ductus Arteriosus
A fetal blood vessel that connects the pulmonary artery to the aorta, allowing blood to bypass the lungs in utero, which normally closes after birth.
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