The important features of human heart are:
1.)Human heart is four chambered.
2.)The heart is covered by a double-layered tissue known as pericardial tissues.
3.)In between the two layers of pericardial tissues lies pericardial fluid.
4.)The Right Auricle and Ventricle carry deoxygenated blood while the Left Auricle and Ventricle carry oxygenated blood.
5.)The auricles and ventricles undergo systole(contraction) and diastole(relaxation)alternatively and both rest for 0.40 sec.
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 1)the human heart is located within the thoracic cavity
 2)the shape of the heart is similar to a pinecone
 3)a typical heart is approximately the size 12cm
 4)the human heart has four chambers two superior atria and two inferior ventricles
 5)The blood exiting the systemic capillaries is lower in oxygen concentration than when it entered.
 6)the right ventricle pumps deoxygenated blood into the pulmonary truck.