Human Heart Circulation

Human Heart:-

                    Human heart (Greek Cardium) is muscular pumping organ.It is conical in shape and is generally about the size of your tightened fist. it is found on the left side of the thoracic (chest) cavity. Heart is covered by a thugh double membrane called pericardium. This membrane protects the heart from over extension specially when pericardium. This membrane protects the heart from over extension especially when we run or take a hard exercise. Both the membranes are slightly apart and in between them present a small cavity called pericardial cavity filled with a fluid, the pericardial fluid. Which lubricates the heart to ease the movement and protect the heart from any mechanical injury.

Heart consists of four chambers; two auricles (also called atria) and two ventricles.

Heart is composed of cardiac muscles which are specialized type of muscles keep working day and night, untiringly.