It is the major pumping organ associated with the circulatory system. Human heart contains four chambers, upper two are called Auricles and are divided by an auricular septum into left and right and lower two are called ventricles divided into two by the ventricular septum into left and right. In mammalian heart right side is responsible for collecting impure blood and left side is responsible for collecting pure blood.
One thin membrane covers the heart externally that is called pericardial membrane. The cavity between this membrane and heart wall is called pericardial cavity that is filled with thick, gelatinous fluid called pericardial fluid. Pericardial fluid protects the heart from external injury, keeps heart moist and makes movement heart frictionless.
Wall of right atrium contains natural pacemaker from where the waves of contraction of the heart start. The heart pumps blood with the help of regular contraction and relaxation. During circulation blood flows following route:
Impure blood in right auricle ----- >Right ventricle ( by opening of Tricuspid valve) ------> Pulmonary artery (by the opening of pulmonary valve) -------> Lungs ( Oxygenation) -------> Pulmonary vein ------> Left auricle ------> Left ventricle ( by opening of bicuspid valve) -------> Aorta ( by opening of Aortic valve) -------> tissues of body (exchange of gases and waste products) --------> Vena cava -------> Right auricle
Which part of the heart receives impure blood and which part receives pure blood?
The right part of the heart receives the impure blood whereas the left part of the heart receives the pure blood.
|Tricuspid valve||Bicuspid valve|
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