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The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...
The Greek physician Galen (2nd century CE) knew blood vessels carried blood and identified venous (dark red) and arterial (brighter and thinner) blood, each with distinct and separate functions. [91] Galen, noting the heart as the hottest organ in the body, concluded that it provided heat to the body. [93]
Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; myocardium structure; the electrical conduction system of the heart; the cardiac cycle and cardiac output and how these interact and depend on one another.
The LAA appears to "function as a decompression chamber during left ventricular systole and during other periods when left atrial pressure is high". [12] It also modulates intravascular volume by secreting natriuretic peptides , namely atrial natriuretic peptide (ANP) , and brain natriuretic peptide (BNP) into the coronary sinus , where they ...
The right heart pumps deoxygenated blood to the lungs in the pulmonary circulation. In the human heart there is one atrium and one ventricle for each circulation, and with both a systemic and a pulmonary circulation there are four chambers in total: left atrium, left ventricle, right atrium and right ventricle. The right atrium is the upper ...
A ventricle is one of two large chambers located toward the bottom of the heart that collect and expel blood towards the peripheral beds within the body and lungs. The blood pumped by a ventricle is supplied by an atrium, an adjacent chamber in the upper heart that is smaller than a ventricle.
The heart is a four-chambered organ consisting of right and left halves, called the right heart and the left heart. The upper two chambers, the left and right atria, are entry points into the heart for blood-flow returning from the circulatory system, while the two lower chambers, the left and right ventricles, perform the contractions that ...
Trabeculae ratios of capillary-to myocyte differ between the walls of the right and left ventricle. In the left ventricle, each capillary delivers oxygen to one myocyte. However, in the right ventricle the capillary-to myocyte ratio is 0.8 because the right ventricle tissues have a lower oxygen consumption due to a weaker afterload. [6]