File Name: human heart parts and their functions .zip
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Cells of the adult human heart
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The human heart is a finely-tuned instrument that serves the whole body. It is a muscular organ around the size of a closed fist, and it sits in the chest, slightly to the left of center. This delivers oxygen- and nutrient-rich blood to tissues and organs and carries away waste. The heart sends deoxygenated blood to the lungs, where the blood loads up with oxygen and unloads carbon dioxide, a waste product of metabolism. Together, the heart, blood, and blood vessels — arteries, capillaries, and veins — make up the circulatory system. In this article, we explore the structure of the heart, how it pumps blood around the body, and the electrical system that controls it.
The heart is made up of four chambers. The upper two chambers are called atria singular: atrium and the lower two are known as ventricles singular: ventricle. On the right side of the heart, the right atrium and ventricle work to pump oxygen-poor blood to the lungs. These valves open when blood passes through them and then close to keep the blood from flowing in the wrong direction. The four chambers of the heart are attached to major veins or arteries that either bring blood into or carry blood away from the heart. The atria are the receiving stations of the heart. The right atrium receives its supply of oxygen-poor blood from the two largest veins in the body, the superior and inferior vena cava.
Anatomy of a Human Heart
Your heart does a lot of work to keep the body going. Each day, the average human heart beats about , times, pumping 2, gallons of blood through the body. In fact, the heart does more physical work than any other muscle over a lifetime. Located between the lungs in the middle of the chest, the heart pumps blood through the network of arteries and veins known as the cardiovascular system. Blood delivers oxygen and nutrients to every cell and removes the carbon dioxide and other waste products made by those cells. Blood is carried from the heart to the rest of the body through a complex network of arteries, arterioles and capillaries. Blood is returned to the heart through venules and veins.
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The current approach to understanding cardiac dynamics relies upon movements that adhere to the conventional topographical separation of cardiac muscle into the left ventricle, right ventricle, and septum. Functional analyses have addressed them independently, and this approach has resulted in many suppositions that this report will define and question. Alternatively, cardiac muscle mass is formed by the helix and surrounding circumferential wrap described by Lower in the s [ 1 ], Senac in the s [ 2 ], Krehl in the s [ 3 ], Mall in the s [ 4 ], and more recently by Torrent Guasp [ 5 ].
The cardiovascular system can be thought of as the transport system of the body. This system has three main components: the heart , the blood vessel and the blood itself. Blood can be thought of as a fluid which contains the oxygen and nutrients the body needs and carries the wastes which need to be removed.
The cardiovascular system is a closed system if the heart and blood vessels. The heart pumps blood through a closed system of blood vessels. Blood vessels allow blood to circulate to all parts of the body. The vital importance of the heart is obvious.
The human heart is a four-chambered muscular organ , shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane. The visceral layer of the serous membrane forms the epicardium.
The heart pumps blood through the body with the help of structures such as ventricles, atria, and valves. The heart is a complex muscle that pumps blood through the three divisions of the circulatory system: the coronary vessels that serve the heart , pulmonary heart and lungs , and systemic systems of the body. Coronary circulation intrinsic to the heart takes blood directly from the main artery aorta coming from the heart. For pulmonary and systemic circulation, the heart has to pump blood to the lungs or the rest of the body, respectively. The heart muscle is asymmetrical as a result of the distance blood must travel in the pulmonary and systemic circuits. Since the right side of the heart sends blood to the pulmonary circuit, it is smaller than the left side, which must send blood out to the whole body in the systemic circuit. In humans, the heart is about the size of a clenched fist.
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