Human body- Heart ( 1 )

Heart size, heart location and its orientation
It is about the size of a clenched fist, heart is located obliquely within the mediastinum of the thorax.

Covering of a heart 
The heart is enclosed within a double sac made up of the outer fibrous pericardium and the inner serous pericardium (parietal and visceral layers). The pericardial cavity between the serous layers contains lubricating serous fluid.

Layers of a heart wall
Layers of a heart wall are from the interior out, there are endocardium, the myocardium (the irenforced by a fibrous skeleton) and the epicardium (visceral layer of the serous pericardium) as cover of it.
 
Heart's chambers and the associates great vessels
It has two superior atria and two inferior ventricles, they rare functionally the heart is a double pump.


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