Human Heart

General Description of the Human Heart

Structure: Conical, four-chambered, double-pump mechanism.
Layers: Three-layered wall: Epicardium (outer), Myocardium (middle, muscular), and Endocardium (inner).
Protection: Enclosed in a tough double-layered sac called the pericardium.
Chambers: Two upper chambers (atria) and two lower chambers (ventricles)

Feature	Specification
Weight	~280–340g (Males), ~230–280g (Females)
Dimensions	~12 cm (length) x 8.5 cm (width) x 6 cm (thickness)
Chambers	4 (Right Atrium, Right Ventricle, Left Atrium, Left Ventricle)
Layers	3 (Epicardium, Myocardium, Endocardium)
Valves	4 (Tricuspid, Pulmonary, Mitral/Bicuspid, Aortic)
Function	Pumps blood through pulmonary and systemic circuits
Location	Middle mediastinum, behind sternum, between lungs

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