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Heart

(Encyclopedia) Heart, river, 180 mi (290 km) long, rising in the low prairie country near the Little Missouri River, SW N.Dak., and flowing E to the Missouri at Mandan, N.Dak. The Heart Butte and…

heart

(Encyclopedia) heart, muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and…

Anatomy and
Physiology: The Heart

The HeartAnatomy and PhysiologyThe HeartAnatomy of the HeartThe Four ChambersThe Heart's Own BloodECG: Measuring a Beat Valentine's Day, at least the greeting card variety, has forever done the…

DK Human Body: Heart

WHAT’S INSIDE THE HEART? WHAT IS THE HEART MADE OF?HEARTBEATFIND OUT MOREBlood is driven around the body by the heart, a powerful muscular pump that never stops beating. The heart is a dual pump.…

Anatomy and
Physiology: Anatomy of the Heart

Anatomy of the HeartAnatomy and PhysiologyThe HeartAnatomy of the HeartThe Four ChambersThe Heart's Own BloodECG: Measuring a Beat The four-chambered heart is the result of millions of years of…

athlete's heart

(Encyclopedia) athlete's heart, common term for an enlarged heart associated with repeated strenuous exercise. As a result of the increased workload required of it, the heart will increase…

heart, artificial

(Encyclopedia) heart, artificial, external or surgically implanted mechanical device designed to replace a patient's diseased heart. The first one used on a human being, the Jarvik-7, was…

heart attack

(Encyclopedia) heart attack: see under infarction.

heart disease

(Encyclopedia) heart disease, any of several abnormalities of the heart and its function in maintaining blood circulation. Heart disease is the cause of approximately half the deaths in the United…