CardioDiseasePrint10

CardioDiseasePrint10 - Cardiovascular Disease...

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Cardiovascular Disease
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Cardiovascular Disease Emergency Room The patient is wheeled into the emergency room- a victim of an automobile accident. The emergency room staff immediately slaps electrodes on his chest to measure his electrocardiogram (ECG), check his pulse on his wrist and neck and measure his blood pressure. He is conscious and afraid. The staff tells him that he is ok- just a little shaken up and he has some minor bruises. However one of the nurses notices that his heart rate is very fast and the ECG does not look normal. Are these signs just due to stress of the accident and pose no immediate threat to the patient-or - are they predictors of a biological failure of the heart? Within minutes of his reassurance, the patients feels a deep pressure on his chest and his ECG records no electrical waves. His heart rate is not able to be detected. . The emergency team scrambles to take care of this heart failure. The cardiovascular system is without doubt the major biological system in multicellular animals that is responsible for transferring oxygen to the mitochondria in all cells as well the nutrients needed by the cells to generate ATP. The blood also transfers the metabolic end products such as carbon dioxide from the millions of cells and releases them into the environment by way of the kidneys or lungs in the case of humans.
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Figure 1 Textbooks usually state that the major function of the cardiovascular system is to pump blood to all cells. While that is correct, it is not its primary function. The primary function of the cardiovascular system is to transfer oxygen to the cells by way of the blood. The various reflexes that maintain the cardiovascular system working sense blood oxygen and carbon dioxide levels as well as pressure. Overall, the circulatory system is a pressure generating system that controls the transfer of oxygenated blood to all cells in your body. Blood flow follows the change in pressures produced by the cardiovascular system. Circulation Pattern: The freeway- Designed to be in parallel. The cardiovascular system has a circulation pattern that is a masterpiece of engineering. It is designed to ensure that all cells receive the mitochondria supporting oxygen. The circulation pattern is arranged in parallel so that in the event that there is a decrease in blood to certain organs, there can be an instantaneous redirection of blood to the major organs. For example, freeways are also designed with parallel systems. If there is a major accident on the freeway and all roads were in series, one leading to another, there would be no way for you to leave the traffic blocked freeway. However, if there is a side road that runs parallel to the freeway, you can take it in the event the major freeway is blocked. In the same way, the circulation system is designed. The arteries supply all organs but in a parallel fashion. Thus the blood supply to the brain does not depend on the blood coming from the legs first. Even if blood supply to the legs is compromised blood will continue to
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CardioDiseasePrint10 - Cardiovascular Disease...

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