Chamber Contraction And Conduction Pathways In The Human Heart-noiseware

Careers-Employment The heart serves as the primary pumping mechanism that pushes blood through the vessels that deliver oxygen and nutrients to each cell in the body. Given that nutrients are used up relatively quickly in normal metabolic processes and wastes are constantly being produced, it is absolutely critical that the heart remain functional at all times throughout the course of a typical lifespan. .mon diseases such as diabetes, high blood pressure, and obesity can interfere with the ability of the heart to pump blood by damaging muscle cells and nerve fibers. The fact that these chronic diet and exercise related illnesses have be.e much more prevalent in the United States over the past several years means that cardiac care is in greater demand and the need for qualified EKG technicians has increased. Individuals who are considering this profession as a possible career path are well-advised to develop a basic understanding of cardiac contraction and electrical conduction prior to pursuing a job opportunity. The standard human heart contains four chambers that work together to move blood through the body. In most cases, the best approach to understanding the role of each chamber is to separate them into two right chambers and two left chambers. The chambers on the right side of the heart are responsible for pumping oxygen poor blood to the lungs while the chambers on the left side of the heart are responsible for receiving oxygenated blood from the lungs and pumping it to the rest of the body. Each side of the heart contains a small top chamber known as an atrium that works to push blood into a larger bottom chamber known as a ventricle. The ventricles are larger because they are required to push blood out of the heart through vessels that create resistance. The thicker ventricular walls are capable of applying more force than those of the atria and are better suited to moving large amounts of blood. In order for blood to flow in the proper direction, it is important for the right and left atria to contract before the right and left ventricles. The delayed contraction of the ventricles allows the ventricles to fill with blood before contracting. This process also ensures that valves between each atrium and ventricle snap shut at the onset of ventricular contraction so that blood does not flow back into the atria. The coordinated contraction of the hearts chambers is ac.plished through the creation of an electrical stimulus at a specialized area of nerve tissue called the sinoatrial (SA) node. The SA node is strategically located at the top of the right atrium and gives rise to nerve fibers that transmit the contractile signal down through the atria to a second collection of nerve fibers known as the atrioventricular (AV) node. The SA node creates a contractile signal at a rate of 60 100 times per minute depending on the oxygen needs of the body and the overall contractile efficiency of the heart. Once the signal to contract has been initiated, it travels through the left and right atria on its way to the AV node. As the signal travels, it is rapidly propagated among all of the contractile cells in a given chamber through the use of special cellular connections known as gap junctions. The rapid dissemination of the electrical signal is important because it ensures that all of the cardiac cells in a chamber contract simultaneously. This allows each chamber to exert maximum contractile force on the blood that is contained within it. From the AV node, the signal is conducted along two large nerves known as the left and right bundle branches that give rise to smaller nerves known as Purkinje fibers. These fibers are responsible for carrying contractile signals directly to cardiac cells and are able to conduct electrical impulses faster than any other nerve in the body. Those who plan to seek employment as a technician in cardiac care will learn much more about the steps involved in cardiac conduction and contraction during the training and certification process. These concepts are critically important for technicians to master because they allow individuals to provide .prehensive care to patients and better educate the public about the importance of heart health. Technicians who demonstrate a passion for learning and a .mitment to high quality care will experience many years of success and numerous opportunities for advancement. About the Author: 相关的主题文章: