Anatomy of the Heart
Reference work entry
In the human embryo, the unique little heart begins to beat as early as day 22 ( Embryology). The adult human heart is a small pump that has a mass of only 200–400 g and is a highly efficient converter of chemical energy to mechanical energy (Taegtmeyer 2004). The heart uses more energy, in the form of adenosine triphosphate (ATP), than any other organ. More than 6 kg of ATP is hydrolyzed by the heart daily (Ingwall 2002) for pumping 5 l of blood/min, 7,200 l/day, and over 2.6 million liters/year (Kumar et al. 2005). The myocardium is as strong or stronger than the powerful thigh muscles, the quadriceps. Yet, this powerful organ that utilizes more than 6 kg ATP and pumps more than 2.6 million liters of blood/year is supplied by only three rather small arteries that have the diameter of a soda straw.
- Gaudin AJ, Jones KC (1989) Human anatomy and physiology. Harcourt Brace Jovanovich, San Diego, CAGoogle Scholar
- Ingwall JS (2002) ATP and the heart. Kluwer Academic, Boston, MA, p 16Google Scholar
- Kumar V, Abbas AK, Fausto N et al (2005) Pathologic basis of disease, 7th edn. Elsevier Saunders, Philadelphia, PAGoogle Scholar
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