Heart Academic Journals

 In humans, heart is roughly the size of a large fist and weighs between about 10 to 12 ounces (280 to 340 grams) in men and eight to ten ounces (230 to 280 grams) in ladies, per Henry Gray's "Anatomy of the chassis."   The physiology of the center essentially comes all the way down to "structure, electricity and plumbing," Phillips told Live Science. The human heart has four chambers: 2 higher chambers (the atria) and 2 lower ones (the ventricles), per the National Institutes of Health. The correct atrium and heart ventricle along structure the "right heart," and also the left atrium of the heart and heart ventricle structure the "left heart." A wall of muscle referred to as the septum separates the 2 sides of the center. A double-walled sac referred to as the serous membrane encases the center that serves to guard the center and anchor it within the chest. Between the outer layer, the serous membrane, and also the inner layer, the body fluid serous membrane, runs serous membrane fluid, which lubricates the center throughout contractions and movements of the lungs and diaphragm. The heart's outer wall consists of 3 layers. The outmost wall layer, or visceral pericardium, is that the inner wall of the serous membrane. The center layer, or cardiac muscle, contains the muscle that contracts. The inner layer, or serous membrane, is that the lining that contacts the blood.