Day three brought about an exploration of the pig's gas and blood circulation systems (including the heart and lungs). This brought about some fascinating discoveries, such as the four chambers of the heart, as well as some unappetizing finds, like the thyroid and the esophagus hidden behind it.
The organ nearest to the incision we made was the heart, shown here between my thumb and forefinger. The heart, as we know, pumps oxygenated and deoxygenated blood throughout the body. 
Removal of the heart revealed large amounts of cardiac muscle, as well as the different sections of the organ. This image is great at showing the four sections of the heart. The top left and top right small sections, along with the bottom left and bottom right large sections are each visible. Scientifically named, the right chambers are named the right atrium (top) and right ventricle. The left chambers are named the left atrium (top) and left ventricle. As shown by the colored dyes in the blood, the right chambers contain the blood that lacks oxygen.
A clearer image of the chambers of the heart, from within.
With the heart removed, the lungs are visible, The wing-like protrusions shown here are the lungs. They, as we know, aide in respiration and spread take in oxygen that they then transport to the bloodstream and circulate through the body.
Above the heart and lungs, closer to the neck area, lies a gland named the thyroid gland.This gland is responsible for regulating metabolic processes as well as hormone levels in the bloodstream. Just behind it, where the scissors are poking, is the lower part of the esophagus, which as we mentioned extends all the way to the lungs to transport air.
A full overview of the heart and lungs (My fingers are separating the rib cage, and the heart is in the center, surrounded by the lungs)
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