The importance of circulatory system learning certainly is important and the reasons vary but are very similarchiefly that people would be able to save their own and others lives by being able to recognize the signs of circulatory compromise and the importance of getting help quickly. Fortunately this system of oxygen and nutrient transport is one of the most logical and easiest to understand systems that there are in the realm of human biology/physiology/pathology and so it is easy to teach and learn this important knowledge.
The circulatory system consists of the heart and blood and the vessels that transport this blood as well as the hormones and nervous system that affect the flow of the blood. Another huge part of this system is the transport of oxygen into the blood and the transport of carbon dioxide out of the blood, something called respiration and involving the lungs.
Oxygen and glucose are key ingredients in the giving power of the cell that allows it to carry out all of the metabolic processes that it carries out to maintain life. So in an indirect way the digestive system is a part of the circulatory system by providing the glucose ingredient. However...
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