In people, the guts is roughly the dimensions of a giant fist and weighs between about 10 to 12 ounces (280 to 340 grams) in males and eight to 10 ounces (230 to 280 grams) in ladies. *A double-walled sac referred to as the pericardium encases the guts, which serves to guard the guts and anchor it contained in the chest. Between the outer layer, the parietal pericardium, and the interior layer, the serous pericardium, runs pericardial fluid, which lubricates the guts throughout contractions and actions of the lungs and diaphragm. *The center’s outer wall consists of three layers. The outermost wall layer, or epicardium, is the interior wall of the pericardium. The center layer, or myocardium, comprises the muscle that contracts. The interior layer, or endocardium, is the liner that contacts the blood.
The tricuspid valve and the mitral valve make up the atrioventricular (AV) valves, which join the atria and the ventricles. The pulmonary semi-lunar valve separates the appropriate ventricle from the pulmonary artery, and the aortic valve separates the left ventricle from the aorta. The heartstrings, or chordae tendinae, anchor the valves to coronary heart muscle tissues. *The sinoatrial node produces pulses that drive coronary heart contractions.
An grownup coronary heart beats about 60 to 80 instances per minute.
Newborns’ hearts beat sooner than grownup hearts, about 70 to 190 beats per minute.
The center pumps about 6 quarts (5.7 liters) of blood all through the physique.
The center is positioned within the middle of the chest, normally pointing barely left.