Posted on 16th March 2010 by admin in Uncategorized

The other organ which is key to a phlabotemy is the heart.  For more then one reason….I mean we all have one, and the heart pumps the blood which phlabotemist must take.  So lets learn some basics today about the heart.  The heart is the major structure of the circulatory system.  It is the “pump” that circulates blood throughout the body.  It is located at the center of the thoracic cavity between the lucng with the apex (tip of heart) pointing down and slightly to the left.  The heart has four chambers that are hollow, muscular organ, slightly larger than a man’s closed fist.  It is surrounded by a thin fluid filled sac called the pericardium and its walls have three distinct layers.  The heart has two sides, a right and a left.  Each side has its walls and have three distinct layers.  The heart has two sides, a right and a left.  Each side has two chambers an upper and a lower.  One-way valves between the chambers help prevent the back-flow of blood and keep it flowing through the heart in the right direction.  The right and left chambers are separated from each other by partitions called septa.  The three layers of the heart are called the epicardium which is the thin outter layer, the myocardium which is the middle muscle layer, and the endocardium (the thin inner layer.)  The chambrs consist of the upper chambers on each side of the heart called the atria, and the lower chamber called the ventricles.  The atria are receiving chambers and and ventricles ar epumping and delivering chambers.  Finally, the valves at the entrance of the ventricles are called atrioventricular valves and the valves that exit the ventricles are called semilunar valves because they are crescent shaped like the moon.

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