If a blood clot forms, it can stop the blood flow. This can cause a heart attack or stroke. A heart attack occurs when the blood flow to a part of the heart is blocked by a blood clot. If this clot cuts off the blood flow completely, the part of the heart muscle supplied by that artery begins to die.
Digestion works by moving food through the GI tract. Digestion begins in the mouth with chewing and ends in the small intestine. As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules.
The start of the process-the mouth: The digestive process begins in the mouth. Food is partly broken down by the process of chewing and by the chemical action of salivary en â¦ zymes (these enzymes are produced by the salivary glands and break down starches into smaller molecules).