Human heart
hideThe human heart provides a continuous blood circulation through the cardiac cycle and is one of the most vital organs in the human body. It is divided into four chambers: the two upper chambers are called the left and right atria and two lower chambers are called the right and left ventricles. Normally the right ventricle pumps the same blood amount into the lungs with each bit that the left ventricle pumps out. Physicians commonly refer to the right atrium and right ventricle together as the right heart and to the left atrium and ventricle as the left heart.
The electric energy that stimulates the heart occurs in the sinoatrial node, which produces a definite potential and then discharges, sending an impulse across the atria. The Purkinje fibers transmit the electric charge to the myocardium while the cells of the atrial walls transmit it from cell to cell, making the atrial syncytium.
The human heart and its disorders (cardiopathies) are studied primarily by cardiology.
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News tagged with human heart
Human cardiac master stem cells identified
Jul 01, 2009 |
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(PhysOrg.com) -- Harvard Stem Cell Institute researchers at Massachusetts General Hospital have identified the earliest master human heart stem cell from human embryonic stem cells - ISL1+ progenitors - that ...
Protein that triggers plant cell division
Jun 11, 2009 |
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From the valves in a human heart to the quills on a porcupine to the petals on a summer lily, the living world is as varied as it is vast. For this to be possible, the cells that make up these living things must be just as ...
'Beating' heart machine expedites development of new tools for heart surgery (w/Video)
May 12, 2009 |
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A new machine developed at North Carolina State University makes an animal heart pump much like a live heart after it has been removed from the animal's body, allowing researchers to expedite the development ...
New Medtronic heart device uses 'super plastic' from NASA
May 07, 2009 |
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A "super plastic" invented by NASA engineers for use in aeronautic and space applications is now being used in a medical device that treats people suffering from heart failure.
Scientists identify key factors in heart cell creation
Apr 26, 2009 |
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Scientists at the Gladstone Institute of Cardiovascular Disease have identified for the first time key genetic factors that drive the process of generating new heart cells. The discovery, reported in the current ...
