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.
  Digestion starts in the mouth by the enzymes produced by the salivary glands, and the food then goes to the stomach where the gastric, pancreatic juice, and bile and intestinal juice all help to break and digest the food, which then passes down the intestine to get absorbed and get in the body to provide energy.hen glucose and oxygen are both in the body, the cardiovascular transports it via blood to the place in which it is needed in the body, for example the muscles. This is also links with the digestive and respiratory system as it provides the transportation of the energy. + 27 others found this useful.