Portal:Medicine/Selected article/43, 2007
The heart is a muscular organ responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in the annelids, mollusks, and arthropods.[1] The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδία, kardia, for "heart." The heart is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ.[2] The average human heart beating at 72 BPM, will beat approximately 2.5 billion times during a lifetime of 66 years.
(More...)
- ^ The American Heritage Stedman's Medical Dictionary. "Medical Dictionary Definition of heart"..
- ^ The American Heritage Stedman's Medical Dictionary. " Medical Dictionary Definition of cardiac".