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( Heart) The heart is a muscular organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek ?a?d?a, kardia, for "heart."

The heart of a vertebrate is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ. The average human heart beating at 72 BPM, will beat approximately 2.5 billion times during a lifetime spanning 66 years.

The animal heart is derived from embryonic mesoderm germ-layer cells that differentiate after gastrulation into mesothelium, endothelium, and myocardium. Mesothelial pericardium forms the outer lining of the heart. The inner lining of the heart, lymphatic and blood vessels develop from endothelium. Myocardium develops into heart muscle.^[1]

From splachnopleuric mesoderm tissue, the cardiogenic plate develops cranially and laterally to the neural plate. In the cardiogenic plate, two separate angiogenic cell clusters form on either side of the embryo. Each cell cluster coalesces to form an endocardial tube continuous with a dorsal aorta and a vitteloumbilical vein. As embryonic tissue continues to fold, the two endocardial tubes are pushed into the thoracic cavity and begin to fuse together and are completely fused at approximately 21 days.^[2]

Heart Subcategories Heart Articles You can be victim to Heart diseases if you don't think of weight loss by hirnis william Heart disease unless congenital, is a lifestyle disease much like Type 2 Diabetes. By this we mean that it is caused by an unhealthy lifestyle. Not surprisingly, as per statistics available, it is the number one killer in affluent countries like the ... A Hot Way to Maintain a Healthy Heart by Robert Bell While this article may not be about passion, it focuses in part on an organ of our body where the bulk of it comes from - the heart. And to keep the central fires burning brightly within our core, comes a wonderful product of nature that not only ins... Juice Cayenne Pepper Diet: Taking What's Good for the Heart and Blood Circulation by Robert Bell We all know that a proper diet is good for our bodies. But contrary to what most people believe, diet is not specifically intended for losing weight. Although most people who are following it are experiencing a lost of some excess pounds, this is not... Cardiovascular disease: take care of your heart. by Jim Andrews Disease which involves the heart or blood vessels and has an impact over cardiovascular system of body is termed as cardiovascular disease. This includes coronary heart disease i.e. heart attack, high blood pressure, rheumatic heart disease, heart fa... The Atkins Diet Reemeges by jeff behar Dr.Robert Atkins addressed his own weight condition from a diet he read in the Journal of the American Medical Association. Realizing the benefits of the diet he followed Atkins later popularized the idea as The Atkins Diet in a series of books, st... How To Use Hypnosis For Stress Management by Peter Gitundu You have seen those shows where hypnosis is used dramatically to dissect and determine emotions that are hidden far in the mind. In reality, hypnosis is a good tool for stress management and although not as dramatic as in the films, it has helped a l... Congestive Heart Failure And Depression- Successful Methods Of Treatment by Alan Densky Congestive heart failure, or CHF, is one of the most common chronic health conditions in the United States. Nearly five million individuals live with this disease, and 500,000 more develop CHF each year. This illness may be slightly problematic, or i... Top 10 Health Benefits of Tea by William Lengeman Tea (to borrow a catchphrase) does a body good. While some marketers tend to place undue emphasis on just how much good tea can do us, there's compelling evidence nonetheless to show that it can benefit our health on a number of fronts. Here are so... Diagnosing Middle Back Pain by Terry O'Brien The facts are that the vast majority of back pains normally occur in the lower back, mid back and the upper back. Of these, mid back pain is quite rare. The middle portion of the body is built for strength and stability, so that the vital internal... The Relationship Between the Oral Health and Heart Attacks by I C Which diseases would you be most afraid of? -- some people may say a stroke, others would say some sort of cancer and heart attacks are definitely within that range. According to recent studies it has been estimated that heart attack if the leading ...