From Wikipedia, the free encyclopedia. In the deep ocean, marine snow is a continuous shower of mostly organic detritus falling from the upper layers of the water column. It is a significant means of exporting energy from the light-rich photic zone to the aphotic zone below.
Coronary Heart Disease. Coronary heart disease (CHD), also called coronary artery disease, occurs when plaque builds up in the coronary arteries. These arteries supply oxygen-rich blood to your heart. Plaque narrows the coronary arteries and reduces blood flow to your heart muscle. Plaque buildup also makes it more likely that blood clots will form in your arteries. Blood clots can partially or completely block blood flow.
Coronary Artery Disease means that the arteries are blocked by plaque, and there is concern that there may be a blockage with a blood clot. This is the new catch phrase for Coronary Heart Disease. It actually better describes the condition that will cause a heart attack.