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The Pericardium

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    Brian W.
    GB
    Brian W.

    The heart is an active organ of the human body. It's pumping action which begins in the very early embryo, continues without stopping until death. during each cycle of it's activity, the heart changes in shape and size and tends also to rotate, the number of cycles per minute is called the heart rate. To reduce the amount of friction resulting from this activity, the heart is included within a serous sac (secretory) , called the pericardium, or pericardial sac. the fibrous pericardium is a very dense fibrous envelope. this envelope forms the outer portion of the pericardial sac. The parietal pericardium is the outer serous membrane. Between the two serous pericardia is a very thin space containing a thin film of pericardial fluid. This lubricating fluid makes the action of the heart much less strenuous. The visceral pericardium intimately covers the surface of the heart, this is also called the epicardium.

    Brian W.
    GB
    Brian W.

    When does the lowest blood pressure occur in the heart cycle?

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