The heart is the body circulatory pump that takes actions in the circulation of blood to the entire body the heart pumps blood into separate blood vessels which are the pulmonary and systemic circulation The heart takes in deoxygenated blood through the veins and delivers to the lungs for oxygenation before pumping to various arteries The arteries provides nutrients and oxygen to body tissues through the transportation of blood to the body The heart is based on the left centre of the chest it consists of four chambers the atria which is the entry halls and the inferior chambers that are the ventricles as seen in the diagram below The atria receive blood form the blood vessels that returns blood to the heart while the ventricles eject blood from the heart The heart consist of different range of tissues and one of the important one is called the cardiac muscle The cardiac muscle cell is myogenic Anne 2014 Chambers of the heart Chambers of the heart 2011 The structure of the heart as seen in the below diagram explains that the right atrium is linked to the right ventricle which pumps the poor oxygen to the lungs The tricuspid valve prevents the backflow of blood into the atrium when the ventricle contracts The left atrium is link to the left ventricle by the bicuspid valve which then pumps the rich oxygen blood to the body
The atrium above is prevented from backflow of blood Each ventricle is attached by the chordae tendineae to its atrioventricular valve the valves are found in the blood vessels leaving the heart The valves allow exit of blood from the heart through the blood vessels Ventricles have thicker muscular walls than atria When each atrium contracts it only needs to push the blood a short distance into each ventricle The left ventricle has even thicker muscular walls than the right ventricle The left ventricle pumps the oxygen rich blood to the body All of the body apart from the right atrium receives poor oxygen blood from the body and pumps it to the right ventricle Tortora 2017 The human heart 2016 The cardiac cycle is an event that occurs when the heart is beating As the heart beats blood circulate through the pulmonary and systemic circulations of the body The cardiac cycle has two phases which are the systole and diastole phase The heart ventricles are filled with blood and relaxed in the diastole while in the systole the ventricles pump blood out of the heart to the arteries When the heart chambers are filled with blood and pumped out of the heart one cardiac cycle is then completed
The cardiac muscle cells are myogenic which allows the regulation of contraction though the muscle cells to contract in a specific way so that the heart can respond to meet the energy demands of the body The sinoatrial node on the right atrium acts as a pacemaker controlling the heart rate Tortora 2017 Blood is a fluid that flows through the body It is thicker than water and is salty to taste There are about 10 6 pints of blood that circulates through the human body Blood is made up of cells called plasma The blood cells are made up three types which are the red blood cells RBCs while blood cells WBCs and platelets Annie 2014 The blood in human body has three main functions which are for transport protection and regulation Blood transports nutrients from digestive system and stores them to other parts of the body The blood also transports heat to the skin to regulate the body temperature The blood regulates by transporting water to and from tissues The blood circulatory system delivers oxygen to the cells in the body
The circulatory system is made up of the heart and the blood vessels Blood are taken from the arteries then transferred back by the veins to the heart Oxygen is provided to the body tissues organs and cells by the systemic circulation The pulmonary circulation is the entrance of fresh oxygen into the blood while this happens carbon dioxide is released from the blood Tortora 2017 When the heart beats blood is pumped around the body to produce energy and oxygen the body needs The movement of the blood pushes the sides of the blood vessels the strength of this pushing of blood vessels is called the blood pressure When the blood pressure is too high it puts extra strain on the arteries and the heart Blood is classified as a connective tissue and consists of two main components which consists of plasma and formed elements Plasma is a clear fluid while the formed elements are made of blood cells The formed elements are knowns as white and red blood cells Torotra 2017 Blood circulation 2016
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