Physics of the Heart Essay - 912 Words

In the US, heart attacks kill more people than any other single cause. Many of the deaths are caused by electrical disturbances in a damaged heart that cause it to fibrillate (Pool). Despite current overwhelming interest in the operations of the human heart, for most of history the human heart has been regarded as a forbidden organ too delicate to tamper with (NOVA). In fact, it might have remained so, were it not for World War II where military doctors, faced with massive numbers of injuries ushered the world into our current medical trajectory. Your body has about 5.6 liters of blood. All of this blood circulates through the body three times every minute. In one day, the blood travels a total of 12,000 miles (NOVA). Rhythmic†¦show more content†¦* Some spontaneous rhythmic currents are myogenic (discussed further in Physiology) * Heating of the â€Å"ostial part of a great vein†, for example termination of the vena cava superior causes acceleration in the rhythm of the whole heart o Additionally, heating of the â€Å"ventricular wall of a great vein† causes very little or no change in the pace of the contractions * The propagation of the contraction within the walls of the auricles and ventricles is not dependent on the action of the nerves lying near the surface of those parts o The contraction continued to be propagated even when the surface of the heart was washed with strong ammonia Hearts can be classified into two groups based on how the heart contraction is initiated: myogenic and neurogenic. Neurogenic hearts depend on an extrinsic neural innervation to initiate the contraction. Without the innervation the heart doesnt beat. Neurogenic hearts are found in crustaceans, spiders, and some insects (Kay 1998). Myogenic hearts contract spontaneously. Myogenic hearts are found in vertebrates and molluscs. In vertebrates a specialized region of cells called the sinoatrial (SA) node, acts as the pacemaker forShow MoreRelatedDoes The Human Circulatory System Apply Physics Concept? Essay1321 Words   |  6 PagesPhysics is known to be a natural science. It majorly entails the study of matter and the motion of matter through time and space, along with related concepts such as force and energy. Does the circulatory system apply concepts in physics as the blood circulates through the entire system? The circulatory system’s main objective is to transport blood throughout all the necessary parts of the body. 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