Digestion  begins in the mouth with chewing and ends in the small intestine.  As food passes through the GI tract, it miâ¦xes with digestive  juices, causing large molecules of food to break down into smaller  molecules.
Tracing the flow of blood through the heart isn't as simple as it may seem. The heart is a complex organ, using four chambers, four valves and multiple blood vessels to provide blood to the body. The flow through the heart is equally complex, with blood moving through the heart, then the lungs, before returning again to the heart.
There are two valves in the heart. They are tricuspid valve and bicuspid valve.There is a possibility of the blood going back into the atria. This is prevented by these two â¦ valves, the tricuspid valve on the right side and the bicuspid valve on the left side.