The heart is a hollow muscular organ that is somewhat pyramid shaped and lies within the pericardium in the mediastinum. It is connected at its base to the great blood vessels but otherwise lies free within the pericardium.

Heart consists of 3 layers:

1. The pericardium is a fibroserous sac that encloses the heart and the roots of the great vessels. Its function is to restrict excessive movements of the heart as a whole and to serve as a lubricated container in which the different parts of the heart can contract.

2. Myocardium

3. Endocardium.


Webster Dictionary Meaning

1. Heart
- A hollow, muscular organ, which, by contracting rhythmically, keeps up the circulation of the blood.
- The seat of the affections or sensibilities, collectively or separately, as love, hate, joy, grief, courage, and the like; rarely, the seat of the understanding or will; -- usually in a good sense, when no epithet is expressed; the better or lovelier part of our nature; the spring of all our actions and purposes; the seat of moral life and character; the moral affections and character itself; the individual disposition and character; as, a good, tender, loving, bad, hard, or selfish heart.
- The nearest the middle or center; the part most hidden and within; the inmost or most essential part of any body or system; the source of life and motion in any organization; the chief or vital portion; the center of activity, or of energetic or efficient action; as, the heart of a country, of a tree, etc.
- Courage; courageous purpose; spirit.
- Vigorous and efficient activity; power of fertile production; condition of the soil, whether good or bad.
- That which resembles a heart in shape; especially, a roundish or oval figure or object having an obtuse point at one end, and at the other a corresponding indentation, -- used as a symbol or representative of the heart.
- One of a series of playing cards, distinguished by the figure or figures of a heart; as, hearts are trumps.
- Vital part; secret meaning; real intention.
- A term of affectionate or kindly and familiar address.
2. Heart
- To form a compact center or heart; as, a hearting cabbage.
3. Heart
- To give heart to; to hearten; to encourage; to inspirit.
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