My Shortlisted Essays
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Abstract: Dorland"s Illustrated Medical Dictionary defines the heart as "the viscus of cardiac muscle that maintains the circulation of the blood". It is divided into four cavities; two atria and two ventricles. The left atrium receives oxygenated blood from the lungs. From there the blood passes to the left ventricle, which forces it via the aorta, through the arteries to supply the tissues of the body. The right atrium receives the blood after it has passed through the tissues and has given up much of its oxygen. The blood then passes through the right ventricle into the lungs where it... 
after the end of ventricular systole until the AV valves open, upon which time it drops and slowly rises again until the next atrial systole.6,2,&4
after the end of ventricular systole until the AV valves open, upon which time it drops and slowly rises again until the next atrial systole.6,2,&4
Summary:
The heart is arguably the most vital organ the human body possesses. Without the heart, none of the tissues in the body would receive the vital oxygen necessary for them to maintain survival. Heart disease is the number one killer of people in America today. Due to this disturbing fact, it is no wonder such a large percentage of the fellowships granted by the National Institutes of Health go towards heart related illnesses.
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