atrium, upper chamber of the heart which receives blood from the veins of its circuit, barotrauma, disease/energy due to unequal pressures between a space inside the body and the ambient pressure, the bends, decompression sickness, blowout plug, part of the cylinder valve that releases excess pressure, bottom time, the time between leaving the surface and ascending, Boyle's Law, at a constant temperature, the absolute pressure and the volume of gas are inversely proportional, buddy breathing, using the same mouthpiece to share air with a dive partner, buddy diver, fully qualified diver who serves as a diver's partner, buddy system, two divers who are responsible for each other's safety, buoyancy, the force that makes objects float, buoyancy compensator (BC), inflatable vest worn and automatically or orally inflated to help control buoyancy, capillaries, let blood flow from the arterioles into the venules.

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