draw well labelled diagram of external structure of human heart

Solution:

In human beings, the heart is a muscular organ. It is divided into four chambers – right auricle, right ventricle, left auricle, and left ventricle. The walls of these chambers are made up of a special muscle called  myocardium, which contracts continuously and rhythmically to distribute blood to all the body cells.
The diagram of external structure of human heart is given below:

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