The Heart And Circulatory System

The cardiovascular system consist of the heart, also known as the circulatory system. The major organs in this system is the heart, blood,capillaries, veins and arteries. When I hear cardiovascular system I automatically think about life itself. We have to have the heart in order to survive. The heart is the major organ in the cardiovascular system, it pumps blood throughout the body to organs, tissue, and cells. Think of the heart as being the fuel pump on the car. The fuel pump has to pump the gas to the engine to keep that car running. Same thing with the heart the heart has to pump blood to our bodies in order for us to run. Then you have the blood it's job is to carry oxygen and nutrients to every cell in the body and to remove any waste

Blood vessels are hollow (this hollow space is called the lumen) so as to allow the blood to pass through. They are also lined with endothelium, which prevents the clotting of the blood that passes through.

William Harvey published the book called “An Anatomical Account of the Motion of the Heart and Blood in Animals” which was officially published a fair time after the other two’s books. He proved that the heart acts as a pump by recirculating the blood, and showed that the blood flows around the body and is carried away by the arteries and is carried back into the heart by the veins. This had a limited impact because likewise to Vesalius, it did not make anyone healthier at the time, and it made more of a long term impact on medicine. He had not found a way to practically cure people because he had just made a book to further people’s knowledge on how the body works. Although his book is very useful for us nowadays, at the time people would not know how to approach it, and really wouldn’t make much of an impact on the people’s health.

Oxygen and nutrients the body requires for function are pumped around this complex network of blood vessels by the heart. At roughly the size of a human fist, the heart is a four-chambered muscle and performs two functions of circulation simultaneously and continuously. Systemic and pulmonary circulation. The heart is made up from three separate layers of cardiac tissue; the outer layer called the pericardium, which is a double sac-like outer covering with serous fluid inside to keep the middle layer, the myocardium from adhering to the outer layer. This middle layer of the heart is the heart muscle which is thicker on the left side, to aid with the pressure needed to sustain systemic circulation. The inner layer of the heart is the endocardium. It’s lining is smooth to help prevent the blood which circulates around the inside of the heart from clotting. The heart is the human body’s in-built pacemaker, and the electrical signals sent through the it cause the heart to contract and relax. This process is triggered by the autonomic nervous system and the contraction and relaxing cycle is

Andreas Vesalius, an anatomy professor began to study the body and perform surgery on cadavers. He was recognized for providing innovative teaching and publication methods during the Renaissance period (Dominiczak 1687). William Harvey, a prominent English physician was famous for his studies of the heart (Dominiczak 317). His research on how the blood circulates helped scholars after him become better physicians. In the early 1600’s, Harvey got notoriety by becoming a physician to King James

William Harvey was born in 1578 in Folkenstone, England. Like many young scholars at the time, he went to Kings College, graduated, and then enrolled at Italy’s famous medical school, University of Padua. As he graduated with high honors, Harvey also accumulated mixed experiences and knowledge coming from his predecessors and colleagues. Among such, the teachings of Claudius Galen regarding the heart’s circulation proved most profound and vague to Harvey. According to Galen, “A natural spirit promoting growth and nutrition was added in the liver and carried throughout the body by the veins” (Silverman 245). Galen suggested that all pulmonary artery and veins were centered on the liver. His hypothetical assumption resulted in a flawed belief about the

One of these was Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus which translates to On the Motion of the Heart and Blood in Animals. He first published it in Frankfurt, 1628 while he was a lecturer at the Royal College of Physicians. It is believed that there was no original copy of the book as it was produced through mass production and so many copies exist in museums today. However, a copy of the original title page of the book is held in the Science Museum, London. William Harvey's book on wasn't specifically created for someone. Instead, curiosity about the body resulted in him recording his findings in a logical form. However, a Greek physician by the name of Galen influenced many Renaissance physicians at the time, which made the possible success of his theory difficult, as patients deserted his practice and the medical community questioned his success. William Harvey shows a view of The Motion of the Heart and Blood in animals that reflects knowledge he had gained and the support of Kings Charles and James 1 through publicity and valued opinions. Harvey's intention was to inform the readers and fellow physicians that the blood flowed around the body, which is what he

Harvey was the first scientists to accurately lay out and describe the functions of the human circulatory system. In 1593, at the age of 21 Harvey attended the University of Padua in Italy. His teacher Hieronymus Fabricius and him had become good friends and he had taught Harvey to use the method of dissection to better understand the human body. He had learned about the arteries and veins in the circulatory system and the valves within the veins. Harveys discovery dates back all the way to the thirteenth century when the respiratory system was described by Ibn al-Nafis. Harvey was well interested in the vascular system he decided to write a book containing his work called ‘Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus’ ( Latin for "An Anatomical Exercise on the Motion of the Heart and Blood in Living Beings") or more commonly known as “ De Motu Cordis” which was later published in 1628 in Frankfurt (Famous Scientists). In 1553, a spanish theologian and physician named Michael Servetus believed that the blood would travel from the heart and then into the lungs, where it combines with air and then circulates back to the heart. Harvey realized that the muscle contractions

Harvey left a long lasting legacy to the medical world. Without his discoveries we would not know some of the things we know today. His discoveries were crucial to some of the theories to come later . His work could also be called vital because of his hypotheses, experiments, and conclusions. These all led to the discovery of modern physiology .Using experiments in animals such as the snake, he demonstrated that the blood passed from the veins to the right side of the heart (the right ventricle), that the supposed pores in the septum of the heart did not exist, and that the right ventricle propelled the blood into the lungs(Harvey, William paragraph 4). It then returned to the left side of the heart. Harvey 's discovery was perhaps natural that so novel and original a discovery that it would naturally generate controversy. On the continent, Leyden was the first university to accept Harvey 's conclusions; in many other schools, particularly in Paris, it was a further half century before Harvey 's work was fully appreciated. So important was his work, however, that by the beginning of the eighteenth century the great Dutch teacher of medicine in Leyden, Hermann Boerhaave, stated that nothing that had been written before Harvey was any longer worthy of consideration.

William Harvey is credited for being the first person to accurately detail the function of the heart and the circulation of blood in the body. An esteemed physician, Harvey preferred relying on his own observations and experiments rather than medical textbooks. At 50 years old, Harvey published what is commonly known as De Moto Cortis. Harvey’s experiments consisted of dissections involving cutting the veins and arteries of living animals, which was necessary to understand how the heart and circulatory system worked. He found errors in an ancient physician named Galen’s work and discredited them. Although some people refused to accept Harvey’s findings, many people saw the truth of Harvey’s work. Harvey’s final contribution was at age 73,

The Cardiovascular system is an significant system due to the many functions that it has that are important to the body. Many parts of the body have certain stations that are effective in transferring blood, these are known as the veins, arteries, valves, the 4 chambers of the heart, the left and right atrium and the left and right ventricle. Veins return blood to the heart, two very significant veins are the Superior and Inferior vena cava veins. These veins are the most important because of the jobs they have, Inferior vena cava carries the deoxygenated blood from the lower half of the body to the right atrium which is a chamber in the heart and the superior vena cava carries the deoxygenated blood from the upper half of the body. Increasing our Cardiovascular system benefits in many ways, one big way is it gives us more energy.

William Harvey a world renown scientist is known to have made the most important discovery of humankind. Harvey’s research concluded that the blood circulating throughout the body was a continuous flow in one direction. His discovery began modern cardiology and an increase in observational experiments that were from then on conducted.

Through his investigation founded on beliefs of Aristotle, William Harvey was able to hypothesize on the movement of blood in the body. Prior to William Harvey’s research , the medical view of blood in the body came from a Greek doctor by the name of Galen. Galen explained the flow of blood as a to-and-fro movement being pumped by the veins and arteries themselves. Galen also believed that blood was made and then used up in the body. His conclusions were drawn mainly from outer appearances (Bayon 444). This made Harvey’s work more accurate because he performed specific experiments and calculations. One reason Harvey was able to determine the movement of blood through the body was founded in Aristotle’s belief of the perfection of circular motion because it is continuous path (Pagel 28). William Harvey combined this idea with Arsitotle’s view of the power of the heart to act independently of the brain. From these notions, Harvey created the theory of a constant circulation of blood throughout the body by the pumping of the heart. He began researching his hypothesis with a hen’s egg. He discovered that the first drops of blood in the hen’s egg eventually gave

Home: Where the Heart Is – An outline and tour of the heart from Franklin Institute.

The cardiovascular system, also known as the circulatory system is made up of the heart, the blood vessels and the blood. It is a double circulatory system because it is made up of two different circuits; the pulmonary circuit which is between the heart and lungs and the systemic circuit which is between the heart and the other organs around transferring the nutrients and waste in and out of the body. This means the blood passes through the heart twice during the cardiac cycle.